Microparticles and curable organopolysiloxane composition containing the same
View Patent ↗The present invention relates to microparticles comprising: at least one type of a platinum-based catalyst; and a thermoplastic polyolefin resin with a Z-average (Mz) of a weight average molecular weight (Mw) of at least 2500 and Mz/Mw of not more than 2.0, wherein the platinum-based catalyst is dispersed in the thermoplastic polyolefin resin. The microparticles make it possible to obtain a one-component curable organopolysiloxane composition having characteristics such as excellent storage stability.
1. Microparticles comprising:
at least one type of a platinum-based catalyst; and
a thermoplastic polyolefin resin with a Z-average (Mz) molecular weight of at least 2500 and Mz/Mw of not more than 2.0,
wherein the catalyst is dispersed in the thermoplastic polyolefin resin.
2. The microparticles according to claim 1 , wherein a melting point of the thermoplastic polyolefin resin is from 40 to 200° C.
3. The microparticles according to claim 1 , wherein the thermoplastic polyolefin resin is a polyolefin wax.
4. The microparticles according to claim 3 , wherein the polyolefin wax is selected from the group consisting of polyethylene waxes, polypropylene waxes, polybutene waxes, and combinations thereof.
5. The microparticles according to claim 1 , wherein an average particle diameter is from 0.01 to 500 μm.
6. The microparticles according to claim 1 , wherein the catalyst is a hydrosilylation reaction catalyst.
7. The microparticles according to claim 6 , wherein the platinum metal content of the catalyst is from 0.1 to 50.0 weight %.
8. A curable organopolysiloxane composition comprising:
(A) an organopolysiloxane represented by the average unit formula:
R a SiO (4−a)/2
wherein, R is a substituted or unsubstituted monovalent hydrocarbon group, and “a” is a number from 1.0 to 2.3, and having at least an average of 1.5 alkenyl groups in a molecule;
(B) an organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in a molecule; and
(C) the microparticles described in claim 6 .
9. The curable organopolysiloxane composition according to claim 8 , wherein a content of component (B) is in an amount such that a quantity of silicon-bonded hydrogen atoms in component (B) is from 0.05 to 20 mol per 1 mol of alkenyl groups in component (A).
10. The curable organopolysiloxane composition according to claim 8 , wherein a content of component (C) is in an amount to promote crosslinking of the composition by a hydrosilylation reaction.
11. The curable organopolysiloxane composition according to claim 8 , further comprising (D) a reaction inhibitor in an amount of from 0.001 to 5 parts by weight per 100 parts by weight of component (A).
12. The microparticles according to claim 2 , wherein an average particle diameter is from 0.01 to 500 μm.
13. The microparticles according to claim 3 , wherein an average particle diameter is from 0.01 to 500 μm.
14. The microparticles according to claim 2 , wherein the catalyst is a hydrosilylation reaction catalyst.
15. The microparticles according to claim 3 , wherein the catalyst is a hydrosilylation reaction catalyst.
16. A curable organopolysiloxane composition comprising:
(A) an organopolysiloxane represented by the average unit formula:
R a SiO (4−a)/2
wherein, R is a substituted or unsubstituted monovalent hydrocarbon group, and “a” is a number from 1.0 to 2.3, and having at least an average of 1.5 alkenyl groups in a molecule;
(B) an organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in a molecule; and
(C) the microparticles described in claim 7 .