US4978726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysiloxanes with (meth)acrylate ester groups linked over SiC groups and their use as radiation-curable coating materials for sheet-like carriers
Assignee: Evonik Operations GmbH
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Filing: 1989-05-15
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Granted: 1990-12-18
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Expires: 2009-05-15
Abstract
Abstract Novel polysiloxanes with (meth)acrylate groups and monocarboxylate groups and their use as radiation-curable abhesive coating matrials are disclosed. The modified polysiloxanes adhere well to the support that is to be coated and can be cured at a high rate on the support. The cured coating has good chemical and physical stabilities and a high flexibility. The abhesive properties can be adapted to the chemical character of the adhesives, so that the desired degree of abhesiveness is obtained.
Inventors
- 👤 Hardi Dohler
- 👤 Jurgen Jachmann
- 👤 Christian Weitemeyer
- 👤 Dietmar Wewers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:41
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
171 words
A polysiloxane with (meth)acrylate ester groups linked over SiC groups which is the reaction product of (A) a polysiloxane of the general average formula ##STR38## in which R 1 groups are the same or different and represent lower alkyl with 1 to 4 carbon atoms or phenyl, R 2 groups are the same as R 1 or represent R 3 groups, 70 to 100% of the R 3 groups being epoxy-functional groups and 30 to 0% of the R 3 groups being hydrogen or alkyl groups with 2 to 10 carbon atoms which may be optionally substituted with halogen or phenyl groups, with the proviso that the average molecule contains at least 1.8 epoxy groups, a has a value of 1 to 1,000 and b has a value of 0 to 10; (B) (meth)acrylic acid, in 0.4 to 0.9 molar amount based on the number of epoxide groups and (C) a monocarboxylic acid free of double bonds capable of polymerizing, in an amount effective to react with the remaining epoxide groups.
Claim 2
Dependent Claim
171 words
A polysiloxane with (meth)acrylate ester groups linked over SiC groups which is the reaction product of (A) a polysiloxane of the general average formula ##STR38## in which R 1 groups are the same or different and represent lower alkyl with 1 to 4 carbon atoms or phenyl, R 2 groups are the same as R 1 or represent R 3 groups, 70 to 100% of the R 3 groups being epoxy-functional groups and 30 to 0% of the R 3 groups being hydrogen or alkyl groups with 2 to 10 carbon atoms which may be optionally substituted with halogen or phenyl groups, with the proviso that the average molecule contains at least 1.8 epoxy groups, a has a value of 1 to 1,000 and b has a value of 0 to 10; (B) (meth)acrylic acid, in 0.4 to 0.9 molar amount based on the number of epoxide groups and (C) a monocarboxylic acid free of double bonds capable of polymerizing, in an amount effective to react with the remaining epoxide groups.
Claim 3
Dependent Claim
19 words
A polysiloxane as claimed in claim 1, wherein said monocarboxylic acid of (C) has 2 to 10 carbon atoms.
Claim 4
Dependent Claim
14 words
A polysiloxane as claimed in claim 2, wherein said monocarboxylic acid is acetic acid.
Claim 5
Dependent Claim
30 words
A polysiloxane as claimed in claim 1 or 2, wherein the subscript a has a value of 5 to 200 and the subscript b a value of 0 to 2.
Claim 6
Dependent Claim
17 words
A polysiloxane as claimed in claim 1 or 2, wherein subscript b has a value of 0.
Claim 7
Dependent Claim
20 words
A polysiloxane of claims 1 or 2, in which at least 90% of the R 1 groups are methyl groups.
Claim 8
Dependent Claim
22 words
A polysiloxane of claims 1 or 2, wherein the epoxyfunctional R 3 groups of are selected from the group consisting of ##STR39##
Claim 9
Dependent Claim
37 words
A polysiloxane of claims 1 or 2, wherein the R 2 groups comprise R 3 groups which are alkyl groups selected from the group consisting of ethyl, propyl, n-butyl, iso-butyl, hexyl, octyl, dodecyl, octadecyl, 2-phenylpropyl and 3-chloropropyl.
Claim 10
Dependent Claim
28 words
A radiation curable abhesive coating composition essentially consisting of a polysiloxane as claimed in claim 1 and up to about 5% by weight of a free radical initiator.
Claim 11
Dependent Claim
27 words
A coated product, comprising a substrate having an abhesive surface coating, said coating being formed by a radiation-cured layer of a polysiloxane of claims 1 or 2.
Claim 12
Dependent Claim
19 words
The coated product of claim 10, wherein said layer additionally contains a minor amount of a free radical initiator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |