Silane terminated polymer for coating, adhesives, sealant and elastomer applications
A copolymer-filled crosslinkable silane-terminated polymer having at least one crosslinkable silyl group in each molecule is provided. The copolymer-filled crosslinkable silane-terminated polymer is the reaction product of a copolymer-filled polyol and an isocyanate capped hydrosilylated polymer. The isocyanate capped hydrosilylated polymer is the reaction product of at least one isocyanate and a hydrosilylated polymer. The hydrosilylated polymer is the reaction product of a polymer having at least one unsaturated group and at least one alcoholic group in each molecule and a compound having a hydrogen-silicon bond and a crosslinkable silyl group in each molecule. The copolymer-filled crosslinkable silane-terminated polymers exhibit improved modulus and tensile strength properties while maintaining elongation properties.
1. A composition comprising:
a copolymer-filled crosslinkable silane-terminated polymer having at least one crosslinkable silyl group in each molecule, wherein the copolymer-filled crosslinkable silane-terminated polymer is the reaction product of:
a copolymer-filled polyol; and
an isocyanate capped hydrosilylated polymer comprising the reaction product of:
at least one isocyanate; and
a hydrosilylated polymer comprising the reaction product of:
a polymer having at least one unsaturated group and at least one alcoholic group in each molecule; and
a compound having a hydrogen-silicon bond and a crosslinkable silyl group in each molecule.
2. The composition of claim 1 , wherein the hydrosilylated polymer is reacted with the isocyanate at an isocyanate index of between about 100 and about 250.
3. The composition of claim 1 , wherein the hydrosilylated polymer is a reaction product of a hydrosilylation efficiency of at least about 70% as determined by 1H-NMR.
4. The composition claim 1 , wherein the polymer having at least one unsaturated group and at least one alcoholic hydroxyl group in each molecule has a number average molecular weight of between about 100 and about 5,000.
5. The composition claim 1 , wherein the polymer having at least one unsaturated group and at least one alcoholic hydroxyl group in each molecule is a propylene glycol monoallyl ether having a number average molecular weight between 600 and 1,000 and an OH number between 50 and 90.
6. The composition of claim 1 , wherein the copolymer-filled polyol comprises:
a polyether polyol matrix; and
a solid copolymer phase.
7. The composition of claim 6 , wherein the polyether polyol matrix is derived from ethylene oxide, propylene oxide, butylene oxide, tetramethylene oxide, and combinations thereof.
8. The composition of claim 6 , wherein the solid copolymer phase is at least one of copolymerized styrene and acrylonitrile, styrene-acrylonitrile, acrylonitrile, polyurea (PHD) polymer solids, and polyurethane-urea particles (PIPA).
9. An article comprising the crosslinkable silane-terminated polymer of claim 1 .
10. A method of producing a composition comprising a copolymer-filled crosslinkable silane-terminated polymer having at least one crosslinkable silyl group in each molecule, the method comprising:
providing a polymer having at least one unsaturated group and at least one alcoholic hydroxyl group in each molecule and having a number average molecular weight of between about 100 and about 5,000;
adding to the polymer a compound having a hydrogen-silicon bond and a crosslinkable silyl group in each molecule and a hydrosilylation catalyst to thereby carry out a hydrosilylation reaction to form a composition comprising hydrosilylated polymer;
capping the hydrosilylated polymer by exposing the hydrosilylated polymer to at least one isocyanate at an isocyanate index of between about 100 and about 250 to form a composition comprising isocyanate capped hydrosilylated polymers; and
reacting the isocyanate capped hydrosilylated polymer with a copolymer-filled polyol to form the composition comprising a crosslinkable silane-terminated polymer.
11. The method of claim 10 , wherein the hydrosilylation reaction has a hydrosilylation efficiency of at least about 70% as determined by 1 H-NMR.
12. The method of claim 10 , wherein the polymer having at least one unsaturated group and at least one alcoholic hydroxyl group in each molecule has a number average molecular weight of between about 800 and about 2,000 g/mol.
13. The method of claim 10 , wherein the polymer having at least one unsaturated group and at least one alcoholic hydroxyl group in each molecule comprises a propylene glycol monoallyl ether having a number average molecular weight between about 600 and about 1,000, and an OH number of between about 50 and about 90.
14. The method of claim 10 , wherein the isocyanate index is between about 160 and about 200.
15. The method of claim 11 , wherein the hydrosilylation efficiency is at least about 85%.
16. The method of claim 10 , wherein the compound having a hydrogen-silicon bond and a crosslinkable silyl group comprises at least one of trimethoxysilane, triethoxysilane, methyldiethoxysilane, methyldimethoxysilane, phenyldimethoxysilane, trimethylsiloxymethylmethoxysilane and trimethylsiloxydiethoxysilane.
17. The method of claim 10 , wherein the isocyanate comprises at least one of 4,4′-, 2 , 4 ′ and 2,2′-isomers of diphenylmethane diisocyante, 2,4-toluene diisocyanate and 20% 2,6-toluene diisocyanate, or blends thereof.
18. The method of claim 10 , wherein the crosslinkable silane-terminated polymer is cured with an amine containing catalyst to form a cured polymer.
19. The method of claim 10 , wherein the capping the hydrosilylated polymer is a catalyst-free reaction.
20. The method of claim 10 , wherein the composition comprising the crosslinkable silane-terminated polymer is cured with a tin catalyst.