Coating compositions and textile fabrics coated therewith
A curable coating composition that exhibits improved cure and adhesion to various substrates, especially synthetic textiles used in the manufacture of air bags, and good air pressure holding performance.
1. A curable silicone composition (A) useful for coating textile fabric and comprising:
(1) components (a-1) or (a-2):
(a-1) corresponding to at least one polyorganosiloxane that may be cured by the action of a catalyst based on at least one organic peroxide, and
(a-2) corresponding to a polyorganosiloxane blend that may be cured by a polyaddition reaction, comprising:
at least one organopolysiloxane (I) having an average of at least two silicon-bonded aliphatically unsaturated hydrocarbon substituents on the molecule, and
at least one organopolyorganosiloxane (II) and/or at least one organosilicon crosslinker (II′) having an average of at least 2 silicon-bonded hydrogen on the molecule,
(2) an effective amount of a curing catalyst (III) comprising: when component (a-1) is used, at least one organic peroxide, and when component (a-2) is used, at least one catalyst able to promote reaction of aliphatically unsaturated hydrocarbon substituents with SiH groups,
(3) at least 10 weight parts, per 100 weight parts of the curable silicone composition, of an organopolysiloxane resin (IV) of formula MM Vi Q and consisting essentially of:
(a) monovalent siloxane units M Vi of the formula R′R 2 SiO 1/2 ;
(b) monovalent siloxane units M of the formula R 3 SiO 4/2 , and
(c) tetravalent siloxane units Q of the formula SiO 4/2
wherein R denotes a monovalent hydrocarbon group and R′ denotes a vinyl group:
(4) 1 to 50 weight parts per 100 weight parts of the curable silicone composition of an organopolysiloxane resin (V) different from said organopolysiloxane resin (IV) and comprising at least two different siloxane units chosen from those of M siloxane unit of formula R 3 SiO 1/2 , D siloxane unit of formula R 2 SiO 2/2 , T siloxane unit of formula RSiO 3/2 and Q siloxane unit of formula SiO 412 ,
wherein R denotes a monovalent hydrocarbon group, on condition that at least one siloxane unit being a T or Q siloxane unit and that at least one of the M, D and T siloxane units comprises an alkenyl group
(5) at least one adhesion promoter (VI),
(6) at least one reinforcing filler (VII) comprising calcium carbonate,
(7) optionally at least one polydiorganosiloxane gum (XI) which is a linear or partially-branched homopolymer or copolymer having at least 2 alkenyl groups per molecule and said gum having a viscosity of greater than 500,000 mPa·s at 25° C.,
(8) optionally, at least one curing inhibitor (VIII),
(9) optionally, at least one coloration additive (IX), and
(10) optionally, at least one additive (X) for improving the fire resistance.
2. A curable silicone composition (A) according to claim 1 , wherein the organopolysiloxane resin (V) is selected from the group consisting of:
an organopolysiloxane resin of formula MT Vi Q consisting essentially of:
(a) trivalent siloxane units T Vi of the formula R′SiO 3/2 ;
(b) monovalent siloxane units M of the formula R 3 SiO 1/2 , and
(c) tetravalent siloxane units Q of the formula SiO 4/2
an organopolysiloxane resin of formula MD Vi Q consisting essentially of:
(a) divalent siloxane units D Vi of the formula RR′SiO 2/2 ;
(b) monovalent siloxane units M of the formula R 3 SiO 1/2 , and
(c) tetravalent siloxane units Q of the formula SiO 4/2
an organopolysiloxane resin of formula MDD Vi Q consisting essentially of:
(a) divalent siloxane units D Vi of the formula RR′SiO 2/2 ;
(b) divalent siloxane units D of the formula R 2 SiO 2/2
(c) monovalent siloxane units M of the formula R 3 SiO 112 , and
(d) tetravalent siloxane units Q of the formula SiO 4/2
an organopolysiloxane resin of formula M Vi Q consisting essentially of:
(a) monovalent siloxane units M Vi of the formula R′R 2 SiO 1/2 ; and
(b) tetravalent siloxane units Q of the formula SiO 4/2
an organopolysiloxane resin of formula M Vi T Vi Q consisting essentially of:
(a) monovalent siloxane units M Vi of the formula R′R 2 SiO 1/2 ;
(b) trivalent siloxane units T Vi of the formula R′SiO 3/2 , and
(c) tetravalent siloxane units Q of the formula SiO 4/2
wherein R denotes a monovalent hydrocarbon group and R′ denotes a vinyl group.
3. A curable silicon composition A according to claim 2 , wherein the organosiloxane resin (V) consists essentially of:
an organopolysiloxane resin of formula MT Vi Q consisting essentially of:
(a) trivalent siloxane units T Vi of the formula R′SiO 3/2 ;
(b) monovalent siloxane units M of the formula R 3 SiO 1/2 , and
(c) tetravalent siloxane units Q of the formula SiO 4/2
wherein R denotes a monovalent hydrocarbon group and R′ denotes a vinyl group.
4. A curable silicon composition A according to claim 2 , wherein the organosiloxane resin (V) consists essentially of
an organopolysiloxane resin of formula M Vi T Vi Q consisting essentially of:
(a) monovalent siloxane units M Vi of the formula R′R 2 SiO 1/2 ;
(b) trivalent siloxane units T Vi of the formula R′SiO 3/2 , and
(c) tetravalent siloxane units Q of the formula SiO 4/2
wherein R denotes a monovalent hydrocarbon group and R′ denotes a vinyl group.
5. A curable silicone composition (A) according to claim 1 wherein the organopolysiloxane resin (IV) is added at 15 to 50 weight parts per 100 weight parts of the curable silicone composition.
6. A method of coating a synthetic textile comprising applying the curable silicone composition (A) according to claim 1 to a synthetic textile, and allowing the coating composition to cure.
7. A method according to claim 6 in which the synthetic textile is an airbag fabric.
8. A textile fabric coated on one or two faces with a cured coating composition obtained by curing the curable silicone coating composition (A) according to claim 1 .
9. Inflatable bag comprising an airbag fabric coated according to claim 8 .
10. An airbag fabric coated on one or two faces with a cured coating composition obtained by curing the curable silicone coating composition (A) according to claim 1 .
11. A curable silicone composition A according to claim 1 , comprising component a-2.
12. A curable silicone composition A according to claim 1 , comprising at least one curing inhibitor (VIII).
13. A curable silicone composition (A) according to claim 1 wherein the organopolysiloxane resin (IV) is added at 20 to 40 weight parts per 100 weight parts of the curable silicone composition.
14. A curable silicone composition (A) according to claim 1 , wherein the curable silicone composition (A) after curing and application to a fabric has improved performance in regard to crease flex abrasion tests and improved air holding performance.
15. A curable silicone composition (A) according to claim 1 , comprising 5 to 50% by weight of the at least one reinforcing filler (VII).
16. A curable silicone composition (A) useful for coating textile fabric and comprising:
(1) components (a-1) or (a-2):
(a-1) corresponding to at least one polyorganosiloxane that may be cured by the action of a catalyst based on at least one organic peroxide, and
(a-2) corresponding to a polyorganosiloxane blend that may be cured by a polyaddition reaction, comprising:
at least one organopolysiloxane (I) having an average of at least two silicon-bonded aliphatically unsaturated hydrocarbon substituents on the molecule, and
at least one organopolyorganosiloxane (II) and/or at least one organosilicon crosslinker (II′) having an average of at least 2 silicon-bonded hydrogen on the molecule,
(2) an effective amount of a curing catalyst (III) comprising: when component (a-1) is used, at least one organic peroxide, and when component (a-2) is used, at least one catalyst able to promote reaction of aliphatically unsaturated hydrocarbon substituents with SiH groups,
(3) at least 10 weight parts, per 100 weight parts of the curable silicone composition, of an organopolysiloxane resin (IV) of formula MM Vi Q and consisting essentially of:
(a) monovalent siloxane units M Vi of the formula R′R 2 SiO 1/2 ;
(b) monovalent siloxane units M of the formula R 3 SiO 1/2 , and
(c) tetravalent siloxane units Q of the formula SiO 4/2
wherein R denotes a monovalent hydrocarbon group and R′ denotes a vinyl group:
(4) 1 to 50 weight parts per 100 weight parts of the curable silicone composition of an organopolysiloxane resin (V) different from said organopolysiloxane resin (IV) and comprising at least two different siloxane units chosen from those of M siloxane unit of formula R 3 SiO 1/2 , D siloxane unit of formula R 2 SiO 2/2 , T siloxane unit of formula RSiO 3/2 and Q siloxane unit of formula SiO 4/2 ,
wherein R denotes a monovalent hydrocarbon group, on condition that at least one siloxane unit being a T or Q siloxane unit and that at least one of the M, D and T siloxane units comprises an alkenyl group
(5) at least one adhesion promoter (VI),
(6) at least one reinforcing filler (VII),
(7) optionally at least one polydiorganosiloxane gum (XI) which is a linear or partially-branched homopolymer or copolymer having at least 2 alkenyl groups per molecule and said gum having a viscosity of greater than 500,000 mPa·s at 25° C.,
(8) optionally, at least one curing inhibitor (VIII),
(9) optionally, at least one coloration additive (IX), and
(10) optionally, at least one additive (X) for improving the fire resistance, wherein the organosiloxane resin (V) consists essentially of:
an organopolysiloxane resin of formula M Vi Q consisting essentially of:
(a) monovalent siloxane units M Vi of the formula R′R 2 SiO 1/2 ; and
(b) tetravalent siloxane units Q of the formula SiO 4/2
wherein R denotes a monovalent hydrocarbon group and R′ denotes a vinyl group.
17. A curable silicone composition (A) useful for coating textile fabric and comprising:
(1) components (a-1) or (a-2):
(a-1) corresponding to at least one polyorganosiloxane that may be cured by the action of a catalyst based on at least one organic peroxide, and
(a-2) corresponding to a polyorganosiloxane blend that may be cured by a polyaddition reaction, comprising:
at least one organopolysiloxane (I) having an average of at least two silicon-bonded aliphatically unsaturated hydrocarbon substituents on the molecule, and
at least one organopolyorganosiloxane (II) and/or at least one organosilicon crosslinker (II′) having an average of at least 2 silicon-bonded hydrogen on the molecule,
(2) an effective amount of a curing catalyst (III) comprising: when component (a-1) is used, at least one organic peroxide, and when component (a-2) is used, at least one catalyst able to promote reaction of aliphatically unsaturated hydrocarbon substituents with SiH groups,
(3) at least 10 weight parts, per 100 weight parts of the curable silicone composition, of an organopolysiloxane resin (IV) of formula MM Vi Q and consisting essentially of:
(a) monovalent siloxane units M Vi of the formula R′R 2 SiO 1/2 ;
(b) monovalent siloxane units M of the formula R 3 SiO 1/2 , and
(c) tetravalent siloxane units Q of the formula SiO 4/2
wherein R denotes a monovalent hydrocarbon group and R′ denotes a vinyl group:
(4) 1 to 50 weight parts per 100 weight parts of the curable silicone composition of an organopolysiloxane resin (V) different from said organopolysiloxane resin (IV) and comprising at least two different siloxane units chosen from those of M siloxane unit of formula R 3 SiO 1/2 , D siloxane unit of formula R 2 SiO 2/2 , T siloxane unit of formula RSiO 3/2 and Q siloxane unit of formula SiO 4/2 ,
wherein R denotes a monovalent hydrocarbon group, on condition that at least one siloxane unit being a T or Q siloxane unit and that at least one of the M, D and T siloxane units comprises an alkenyl group
(5) at least one adhesion promoter (VI),
(6) at least one reinforcing filler (VII),
(7) optionally at least one polydiorganosiloxane gum (XI) which is a linear or partially-branched homopolymer or copolymer having at least 2 alkenyl groups per molecule and said gum having a viscosity of greater than 500,000 mPa·s at 25° C.,
(8) optionally, at least one curing inhibitor (VIII),
(9) optionally, at least one coloration additive (IX), and
(10) optionally, at least one additive (X) for improving the fire resistance, comprising 10 to 50% by weight of the at least one reinforcing filler (VII).
18. A curable silicone composition (A) according to claim 17 , wherein the at least one reinforcing filler (VII) comprises calcium carbonate.
19. A curable silicone composition (A) according to claim 17 , wherein the at least one reinforcing filler (VII) comprises silica.
20. A curable silicone composition (A) according to claim 17 , wherein the organosiloxane resin (V) consists essentially of:
an organopolysiloxane resin of formula MT Vi Q consisting essentially of:
(a) trivalent siloxane units T Vi of the formula R′SiO 3/2 ;
(b) monovalent siloxane units M of the formula R 3 SiO 1/2 , and
(c) tetravalent siloxane units Q of the formula SiO 4/2
wherein R denotes a monovalent hydrocarbon group and R′ denotes a vinyl group.