US4320172A
Expired / Lapsed
US
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Organopolysiloxane resin compositions for release papers
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1980-07-01
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Granted: 1982-03-16
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Expires: 2000-07-01
Abstract
Abstract The invention provides a novel in-process release paper, i.e. a release paper used as a backing paper in the manufacturing of, e.g. a synthetic leather with a polyurethane resin. The releasing resin composition with which the release paper is coated is novel as comprising (a) a base resin selected from the group consisting of alkyd resins and acrylic resins modified with an organopolysiloxane, of which from 15 to 50% by moles of the organic groups directly bonded to the silicon atoms in a molecule are phenyl groups, having at least one hydroxy-substituted organic group directly bonded to the silicon atom in a molecule, (b) an alkanol-modified amino resin and (c) an acidic catalyst. The inventive in-process release paper is very superior to the conventional ones in the very much reduced peeling resistance, increased surface gloss and durability in repeated use.
Inventors
- 👤 Minoru Takamizawa
- 👤 Toshio Shinohara
- 👤 Yasushi Yamamoto
- 👤 Tasuku Tanino
- 👤 Kiyoyuki Takano
- 👤 Fumiaki Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:52
CPC Classifications
D; D21; D21H; D21H27/00; D21H27/001; C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A resin composition which comprises (a) 100 parts by weight of a base resin selected from the group consisting of alkyd resins and acrylic resins modified with an organopolysiloxane, of which from 15 to 50% by moles of the organic groups directly bonded to the silicon atoms in a molecule are phenyl groups, having at least one hydroxy-substituted organic group directly bonded to the silicon atom in a molecule as represented by the general formula HO--R.sup.1 (S).sub.a R.sup.2--, in which R 1 and R 2 are each independently a divalent hydrocarbon group and a is zero or 1, (b) from 15 to 150 parts by weight of an alkanol-modified amino resin, and (c) from 1 to 20 parts by weight of an acidic catalyst.
Claim 2
Dependent Claim
124 words
A resin composition which comprises (a) 100 parts by weight of a base resin selected from the group consisting of alkyd resins and acrylic resins modified with an organopolysiloxane, of which from 15 to 50% by moles of the organic groups directly bonded to the silicon atoms in a molecule are phenyl groups, having at least one hydroxy-substituted organic group directly bonded to the silicon atom in a molecule as represented by the general formula HO--R.sup.1 (S).sub.a R.sup.2--, in which R 1 and R 2 are each independently a divalent hydrocarbon group and a is zero or 1, (b) from 15 to 150 parts by weight of an alkanol-modified amino resin, and (c) from 1 to 20 parts by weight of an acidic catalyst.
Claim 3
Dependent Claim
150 words
An in-process release paper which comprises (A) a paper base, and (B) a coating layer formed on the surface of the said paper base of a cured resin composition comprising (a) 100 parts by weight of a base resin selected from the group consisting of alkyd resins and acrylic resins modified with an organopolysiloxane, of which from 15 to 50% by moles of the organic groups directly bonded to the silicon atoms in a molecule are phenyl groups, having at least one hydroxy-substituted organic group directly bonded to the silicon atom in a molecule as represented by the general formula HO--R.sup.1 (S).sub.a R.sup.2 --, in which R 1 and R 2 are each independently a divalent hydrocarbon group and a is zero or 1, (b) from 15 to 150 parts by weight of an alkanol-modified amino resin, and (c) from 1 to 20 parts by weight of an acidic catalyst.
Claim 4
Dependent Claim
150 words
An in-process release paper which comprises (A) a paper base, and (B) a coating layer formed on the surface of the said paper base of a cured resin composition comprising (a) 100 parts by weight of a base resin selected from the group consisting of alkyd resins and acrylic resins modified with an organopolysiloxane, of which from 15 to 50% by moles of the organic groups directly bonded to the silicon atoms in a molecule are phenyl groups, having at least one hydroxy-substituted organic group directly bonded to the silicon atom in a molecule as represented by the general formula HO--R.sup.1 (S).sub.a R.sup.2 --, in which R 1 and R 2 are each independently a divalent hydrocarbon group and a is zero or 1, (b) from 15 to 150 parts by weight of an alkanol-modified amino resin, and (c) from 1 to 20 parts by weight of an acidic catalyst.
Claim 5
Dependent Claim
88 words
The resin composition as claimed in claim 1 wherein the organopolysiloxane is expressed by the structural formula ##STR3## in which Me is a methyl group, Ph is a phenyl group, m and n are each a positive integer with the proviso that m+n is in the range from 30 to 1000 and R is an organic group, at least one of the groups represented by R being the hydroxy-substituted organic group and the groups represented by R other than the hydroxy-substituted organic group being a monovalent hydrocarbon group.
Claim 6
Dependent Claim
26 words
The resin composition as claimed in claim 1 wherein the base resin as the component (a) contains from 0.1 to 50% by weight of the organopolysiloxane.
Claim 7
Dependent Claim
33 words
The resin composition as claimed in claim 1 wherein the alkanol-modified amino resin is selected from the group consisting of methoxymethylol melamine resins, butoxymethylol melamine resins, butoxymethylolurea-melamine cocondensation resins and methoxymethylol bonzoguanamine resins.
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) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |