PARTICLE-MATRIX COMPOSITION COATED WITH MIXTURE COMPRISING POLYSULFIDE POLYMER
The invention pertains to a composition comprising a particle and a matrix, wherein the particle is at least partially coated with a compound or a mixture of compounds a cured polysulfide polymer obtained from a polysulfide polymer having at least two epoxy end groups. Most preferred polysulfide polymers are: wherein n is independently 1-200 and R′ is wherein m is 0 to 10, R 3 is independently H or CH 3 , and the end indicated with the double asterisk is bonded to the epoxide group. The invention further relates to particle-elastomers comprising said composition, and skim products, tires, tire treads, and belts comprising these particle-elastomers.
1 . A composition comprising a particle and a matrix, wherein the particle is at least partially coated with a compound or a mixture of compounds comprising a cured polysulfide polymer obtained from a polysulfide polymer having at least two epoxy end groups.
2 . The composition of claim 1 wherein the particle is a fiber, fibrid, fibril, powder or bead.
3 . The composition of claim 1 wherein the polysulfide polymer is a linear or branched compound having the formula A-B-C, wherein B is a moiety comprising independently 1-200 repeating units of the formula:
—[X—R 2 —X—R 1 —S x ]—
wherein
X is independently CH 2 , S or O;
x is 2, 3, or 4;
R 1 and R 2 are independently selected from substituted or unsubstituted alkylene with 1 to 10 carbon atoms, substituted or unsubstituted arylene with 6 to 10 carbon atoms, alkyleneoxy with 1 to 5 carbon atoms, and alkyleneoxyalkylene with 2 to 10 carbon atoms; wherein the substituent is the moiety comprising independently 1-200 repeating units of the formula:
D-[X—R 2 —X—R 1 —S x ]-E
wherein X, R 1 , R 2 , and x have the previously given meanings;
or X, R 1 and R 2 are independently a bond with the proviso that the moiety X—R 2 —X—R 1 contains at least 2 atoms;
A and C are independently selected from hydrogen and groups containing at least one of halogen, epoxy, hydroxy, isocyanate, silyl, and vinyl; and
one of D and E is a bond and the other has the same meaning as A.
4 . The composition of claim 3 wherein if R 1 and/or R 2 have the meaning substituted alkylene with 1 to 10 carbon atoms, or substituted arylene with 6 to 10 carbon atoms, wherein the substituent is the moiety comprising independently 1-200 repeating units of the formula D-[X—R 2 —X—R 1 —S x ]-E, groups R 1 and R 2 in said repeating unit are independently selected from alkylene with 1 to 10 carbon atoms, arylene with 6 to 10 carbon atoms, alkyleneoxy with 1 to 5 carbon atoms, and alkylencoxyalkylene with 2 to 10 carbon atoms.
5 . The composition of claim 3 , wherein groups A, C, D, and/or E of polysulfide polymer A-B-C are glycidyl or a group obtained by reaction of the diglycidylether of bisphenol A or the diglycidylether of bisphenol F, or a resin thereof, with the proviso that one of D and E is a bond and the other is H, and both A and C are H.
6 . The composition of claim 3 wherein the polysulfide polymer is at least one of
wherein n is independently 1-200 and R′ is
wherein m is 0 to 10, R 3 is independently H or CH 3 , and the end indicated with the double asterisk is bonded to the epoxide group.
7 . The composition of claim 1 wherein the matrix is a wax.
8 . The composition of claim 7 wherein the wax is a saturated alkanecarboxylic acid having 12-40 carbon atoms.
9 . The composition of claim 8 comprising up to 85 wt. % based on the weight of the composition of an aliphatic fatty acid wax, or a synthetic microcrystalline wax having a C22-C38 alkyl chain.
10 . The composition of claim 1 wherein the particle is selected from aramid, polyester, polyamide, cellulose, glass, and carbon.
11 . The composition of claim 1 wherein the particle is selected from chopped fiber, staple fiber, and pulp.
12 . The composition of claim 1 wherein the particle is a poly(p-phenylene-terephthalamide) or a co-poly-(paraphenylene/3,41-oxydiphenylene terephthalamide) fiber.
13 . The composition of claim 1 wherein the particle is a fiber which is pre-treated with a sizing.
14 . The composition of claim 1 wherein the coating amounts 0.5-50 wt. % based on the weight of composition.
15 . A particle-elastomer composition comprising:
(a) 100 parts by weight of at least one natural or synthetic rubber;
(b) 0.1 to 25 parts by weight of an amount of sulfur and/or a sulfur donor, to provide the equivalent of 0.1 to 25 parts by weight of sulfur; and
(c) 0.1 to 20 parts by weight of the composition of claim 1 .
16 . A skim product comprising the particle-elastomer composition of claim 15 and a skim additive.
17 . A tire comprising the composition of claim 15 .
18 . A tire tread, undertread, or belt comprising the particle-elastomer composition of claim 15 .
19 . A tire comprising the skim product of claim 16 .
20 . A tire tread, undertread, or belt comprising the skim product of claim 16 .