Polymer compositions and adhesives, coatings, and sealants made therefrom
Polymer compositions for preparing sealants, adhesives and coatings are provided. The polymer compositions comprise from 1 to 99% by weight of an organic polymer comprising functional silane groups, from 1 to 45% by weight (based on total polymer) of at least one reactive or non-reactive organopolysiloxane polymer; from 0 to 98% by weight (based on total polymer) of an organic polymer that lacks functional silane groups.
1. A curable polymer composition comprising
(a) about 1-99 wt. %, based on total polymer, of a compatiblizer comprising at least one organic polymer having silane groups, the organic polymer having a molecular weight greater than 1000 g/mole and being a polyurethane, polyether, polyester, polycarbonate, polystyrene, styrene butadiene, polybutadiene, butyl rubber, or mixtures thereof,
(b) about 1-45 wt. %, based on total polymer, of at least one reactive organopolysiloxane polymer having a molecular weight of about 10,000 to 200,000 g/mole, the reactive organopolysiloxane polymer containing at least one reactive functional group selected from hydroxyl, alkoxy, acyloxy, ketoximo, amino, amido, aminoxy, alkenoxy, alkenyl and enoxy,
(c) about 0-98 wt. %, based on total polymer, of at least one silane-free organic polymer having a molecular weight greater than 1000 g/mole, and
(d) optionally, up to about 45 wt. %, based on total polymer, of a non-reactive organopolysiloxane.
2. The composition of claim 1 , wherein the reactive organopolysiloxane polymer contains at least one reactive functional group selected from hydroxyl, acyloxy, ketoximo, amino, amino, aminoxy, alkenoxy, alkenyl and enoxy.
3. The composition of claim 2 , wherein the reactive organopolysiloxane polymer contains hydroxyl groups.
4. The composition of claim 3 , wherein the reactive organopolysiloxane polymer is at least partially end-capped with hydroxyl groups.
5. The composition of claim 3 , wherein the reactive organopolysiloxane polymer contains at least one other reactive functional group.
6. The composition of claim 5 , wherein the compatiblizer is at least one of a silylated polyurethane, a silylated allyl terminated polyether, a reactive silylated polyol, a polyether with silicone functional groups and mixtures thereof
7. The composition of claim 6 , wherein the compatiblizer includes a silylated polyurethane.
8. The composition of claim 7 , wherein the polyurethane is end-capped with silane groups and also with alcohol groups.
9. The composition of claim 3 , wherein the compatiblizer is at least one of a silylated polyurethane, a silylated allyl terminated polyether, a reactive silylated polyol, a polyether with silicone functional groups and mixtures thereof.
10. The composition of claim 9 , wherein the compatiblizer includes a silylated allyl terminated polyether.
11. The composition of claim 9 , wherein the compatiblizer includes a reactive silylated polyol.
12. The composition of claim 9 , wherein the compatiblizer includes a polyether with silicon functional groups.
13. The composition of claim 9 , wherein the compatiblizer includes a polyurethane.
14. The composition of claim 6 , wherein the polyurethane is at least partially end-capped with a silane.
15. The composition of claim 14 , wherein the polyurethane is end-capped with silane groups and also with alcohol groups.
16. The composition of claim 14 , wherein the silane is an aminosilane, a mercaptosilane, the reaction product of a mercaptosilane with a monoepoxide or the reaction product of an epoxysilane with a secondary amine.
17. The composition of claim 14 , wherein the silane end-capped polyurethane is prepared by reacting an NCO terminated polyurethane with a silane capping agent to produce a partially silylating polyurethane in which 50% to <100% of the NCO groups are capped with silane and then reacting the partially silylated polyurethane with a non-hindered aromatic or aliphatic alcohol to end-cap any remaining non-silylated NCO groups.
18. The composition of claim 1 , wherein the reactive organopolysiloxane polymer is of the formula:
wherein R 1 and R 2 , independently, are an alkyl group having 1 to 8 carbon atoms, or an unsubstituted or substituted aromatic group having 6 to 10 carbon atom, X is a functional group independently selected from substituted or unsubstituted OH, OR 3 , N(R 4 ) 2 , enoxy, acyloxy, oximo, and aminoxy, wherein R 3 and R 4 are, independently, an alkyl or cycloalkyl having 1 to 8 carbon atoms, “in” is at least two and “n” is a number such that the weight average molecular weight of the reactive organopolysiloxane is from about 10,000 to about 200,000.
19. The composition of claim 18 , wherein the reactive organopolysiloxane polymer is of the formula:
20. The composition of claim 19 , wherein each X group is independently selected from:
wherein R 7 through R 14 are, independently, an alkyl or cycloalkyl having from about 1 to about 8 carbon atoms.
21. The composition of claim 1 , wherein the molecular weight of the organopolysiloxane is about 20,000 to 100,000 g/mole.
22. The composition of claim 1 , wherein the composition contains a silane-free polymer selected from polyurethane, polyether, polyester, polycarbonate, polystyrene, styrene butadiene, polybutadiene, butyl rubber, and mixtures thereof.
23. The composition of claim 1 , wherein the composition further contains a silicone functional cross-linker in an amount of about 0.2% to 4% by weight, based on the weight of the reactive organopolysiloxane.
24. The composition of claim 1 , wherein the composition further contains about 0.01% to 2% (by total weight) catalyst.
25. The composition of claim 1 , wherein the composition further contains a plasticizer.
26. The composition of claim 1 , wherein the composition further contains about 3% to 60% (by total weight) reinforcement agents, semi-reinforcing agents, or combinations thereof.
27. The composition of claim 1 , wherein the composition further contains about 1 to 45 wt. %, based on total polymer, of a non-reactive organopolysiloxane.
28. A curable polymer composition comprising
(a) about 1-99 wt. %, based on total polymer, of a compatiblizer comprising a polyurethane polymer end-capped with silane groups and also with alcohol groups,
(b) about 1-45 wt. %, based on total polymer, of at least one reactive organopolysiloxane polymer having a molecular weight of about 10,000 to 200,000 g/mole, the reactive organopolysiloxane polymer being at least partially end-capped with hydroxyl groups, and
(c) about 0-98 wt. %, based on total polymer, of at least one silane-free organic polymer having a molecular weight greater than 1000 g/mole, and
(d) optionally, up to about 45 wt. %, based on total polymer, of a non-reactive organopolysiloxane.
29. The composition of claim 28 , wherein the silane end-capped polyurethane is prepared by reacting an NCO terminated polyurethane with a silane capping agent to produce a partially silylating polyurethane in which 50% to <100% of the NCO groups are capped with silane and then reacting the partially silylated polyurethane with a non-hindered aromatic or aliphatic alcohol to end-cap any remaining non-silylated NCO groups.
30. The composition of claim 29 , wherein the organopolysiloxane polymer is silanol terminated.
31. The composition of claim 30 , wherein the molecular weight of the organopolysiloxane is about 20,000 to 100,000 g/mole.
32. The composition of claim 1 , wherein the compatiblizer has a molecular weight of greater than about 10,000 g/mole.
33. The composition of claim 28 , wherein the polyurethane polymer has a molecular weight of greater than about 10,000 g/mole.