Claims
- 1. A method for the preparation of a siloxane-based elastomer composition comprising at least one elastomer, said elastomer composition comprising poly(alkylene oxide) groups present in the elastomer as alkoxy-terminated grafts of polysiloxane units and linked to the polysiloxane units by silicon-carbon bonds wherein at least one vinyl functional polymer component is crosslinked in the presence of a peroxide catalyst.
- 2. The method according to claim 1, wherein said peroxide catalyst is a non-vinyl specific catalyst.
- 3. The method according to claim 2, wherein said non-vinyl specific catalyst is dichlorobentsoyl peroxide.
- 4. The method according to claim 1, wherein said peroxide catalyst is a vinyl specific catalyst.
- 5. The method according to claim 4, wherein said vinyl specific catalyst is selected from the group consisting of 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, dicumyl peroxide, tert-butyl cumyl peroxide and 2,2-bis(tert-butylperoxy)butane.
- 6. The method according to claim 1, wherein the elastomer is made up of polysiloxane units which comprise said poly(alkylene oxide) groups.
- 7. The method according to claim 1, wherein the vinyl-functional polymer component comprises a vinyl-functional polysiloxane copolymer having the formula
R′—SiR′R″O(SiR′R″O)r(SiR′R″O)pSiR′R″R —R′where, in the first block, R′ and R″ are the same or different and are a lower alkyl group, or a phenyl group, in which case the said alkyl or phenyl group may be substituted or unsubstituted, and where some of the substituents R′ and/or R″ have been substituted for by vinyl groups, and r is 1 . . . 27000, and where, in the second block, R′ is a lower alkyl group, or an alkoxy-terminated poly(alkylene oxide) group having the formula 3where alk is a lower alkyl group, suitably methyl, R3 is a straight or branched C2-C6 alkyl group, R is hydrogen or a lower alkyl group, and m is 1 . . . 30, or R′ is a phenyl group, in which case the said alkyl or phenyl group may be substituted or unsubstituted, and R″ is a lower alkyl group or a phenyl group, in which case the said alkyl or phenyl group may be substituted or unsubstituted, and p is 1 . . . 5000.
- 8. The method according to claim 7, wherein the vinyl functional polymer component further comprises a vinyl-functional polysiloxane having the formula
R′—SiR′R″O(SiR′R″O)rSiR′R″R′where R′ and R″ are the same or different and are a lower alkyl group or a phenyl group, in which case the said alkyl or phenyl group may be substituted or unsubstituted, and where some of the substituents R′ and/or R″ have been substituted for by vinyl groups, and r is 1 . . . 27000.
- 9. The method according to claim 1, wherein the vinyl-functional polymer component contains a filler, preferably silica.
- 10. The method according to claim 1, wherein the elastomer composition further comprises a non-crosslinked polymer.
- 11. The method according to claim 6, wherein the formula of the polysiloxane unit is
—(SiR′R″O)qSiR′R″—where R′ and R″ are groups, which are the same or different and which are a lower alkyl group, or a phenyl group, in which case the said alkyl or phenyl group may be substituted or unsubstituted, or alkoxy-terminated poly(alkylene oxide) groups having the formula 4where alk is a lower alkyl group, suitably methyl, R is hydrogen or a lower alkyl, R3 is a straight-chain or branched C2-C6 alkyl, and m is 1 . . . 30, possibly some unreacted groups, such as vinyl or vinyl-terminated alkene, and q is 1 . . . 3000.
- 12. The method according to 11, wherein the free R′ and R″ groups are a lower alkyl group, preferably methyl.
- 13. The method according to claim 1, wherein the poly(alkylene oxide) groups are poly(ethylene oxide) groups.
Priority Claims (1)
Number |
Date |
Country |
Kind |
981506 |
Jun 1998 |
FI |
|
Parent Case Info
[0001] This application is a continuation-in-part of application Ser. No. 09/701,547, which is a U.S. National Stage of International application PCT/FI99/00511, filed Jun. 11, 1999.
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09701547 |
Nov 2000 |
US |
Child |
10298197 |
Nov 2002 |
US |