Patent US3933702A successfully refreshed from Google Patents.
US3933702A
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Aqueous release coating compositions for pressure sensitive adhesives
Assignee: Ingredion Inc
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Filing: 1974-07-10
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Granted: 1976-01-20
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Expires: 1994-07-10
Abstract
Abstract Release coating compositions for pressure sensitive adhesive articles, characterized by their excellent properties of remaining migration-free, without the use of an organic solvent, and, that of their ability to be readily separated from the adhesive layer without contaminating the same.
Inventors
- 👤 Ronald J. Caimi
- 👤 Walter F. Schlauch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:21
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/36; C08K5/43; C08L31/00; C08L31/02; C08L31/04; C08L83/00; C08L83/04; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2839
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
367 words
A release coating composition suitable for use with pressure sensitive adhesives in rolled form comprising: A. a hydrocolloid stabilized aqueous emulsion of a film forming vinyl polymer having a T g of from 0° to 60°C. and selected from the group consisting of: i. a crosslinkable copolymer from at least one crosslinkable monomer with at least one member of the group consisting of vinyl acetate; vinyl acetate and at least one member selected from the group consisting of C 2 -C 18 alkyl esters of acrylic and methacrylic acid, C 1 -C 8 dialkyl esters of maleic, fumaric or itaconic acid, ethylene and vinyl chloride; styrene and at least one C 2 -C 18 alkyl ester of acrylic or methacrylic acid; and vinyl chloride and at least one C 2 -C 18 alkyl ester of acrylic or methacrylic acid; and ii. an emulsion polymer selected from the group consisting of vinyl acetate homopolymers; copolymers of vinyl acetate and at least one member selected from the group consisting of C 2 -C 18 alkyl esters of acrylic and methacrylic acid, C 1 -C 18 dialkyl esters of maleic, fumaric or itaconic acid, ethylene and vinyl chloride; copolymers of styrene and at least one C 2 -C 18 alkyl ester of acrylic and methacrylic acid; and copolymers of vinyl chloride and at least one C 2 -C 18 alkyl ester of acrylic and methacrylic acid; said emulsion polymer containing a thermosetting resin to effect crosslinking; and B. from about 0.5 to 20 percent by weight of the emulsion polymer solids, of a release promoting compound selected from the group consisting of: i. polysiloxanes of the general formula: ##EQU7## wherein R is H or an aryl, higher alkyl or alkyl substituted aryl group containing less than 20 carbon atoms, and x, y and z are integers ranging from 1 to 4; and ii. organofunctional silicones of one of the following general formulas: ##EQU8## wherein R is an organic spacer other than alkyleneoxy or polyalkyleneoxy, R' is an alkyl or alkoxy group, X is a reactive member selected from the group consisting of hydroxy, mercapto, amino, carboxyl, chloroalkyl, and vinyl, and x and y are integers of from 1 to 4.
Claim 2
Dependent Claim
367 words
A release coating composition suitable for use with pressure sensitive adhesives in rolled form comprising: A. a hydrocolloid stabilized aqueous emulsion of a film forming vinyl polymer having a T g of from 0° to 60°C. and selected from the group consisting of: i. a crosslinkable copolymer from at least one crosslinkable monomer with at least one member of the group consisting of vinyl acetate; vinyl acetate and at least one member selected from the group consisting of C 2 -C 18 alkyl esters of acrylic and methacrylic acid, C 1 -C 8 dialkyl esters of maleic, fumaric or itaconic acid, ethylene and vinyl chloride; styrene and at least one C 2 -C 18 alkyl ester of acrylic or methacrylic acid; and vinyl chloride and at least one C 2 -C 18 alkyl ester of acrylic or methacrylic acid; and ii. an emulsion polymer selected from the group consisting of vinyl acetate homopolymers; copolymers of vinyl acetate and at least one member selected from the group consisting of C 2 -C 18 alkyl esters of acrylic and methacrylic acid, C 1 -C 18 dialkyl esters of maleic, fumaric or itaconic acid, ethylene and vinyl chloride; copolymers of styrene and at least one C 2 -C 18 alkyl ester of acrylic and methacrylic acid; and copolymers of vinyl chloride and at least one C 2 -C 18 alkyl ester of acrylic and methacrylic acid; said emulsion polymer containing a thermosetting resin to effect crosslinking; and B. from about 0.5 to 20 percent by weight of the emulsion polymer solids, of a release promoting compound selected from the group consisting of: i. polysiloxanes of the general formula: ##EQU7## wherein R is H or an aryl, higher alkyl or alkyl substituted aryl group containing less than 20 carbon atoms, and x, y and z are integers ranging from 1 to 4; and ii. organofunctional silicones of one of the following general formulas: ##EQU8## wherein R is an organic spacer other than alkyleneoxy or polyalkyleneoxy, R' is an alkyl or alkoxy group, X is a reactive member selected from the group consisting of hydroxy, mercapto, amino, carboxyl, chloroalkyl, and vinyl, and x and y are integers of from 1 to 4.
Claim 3
Dependent Claim
45 words
The composition of claim 1 wherein said vinyl polymer contains mers from a crosslinkable comonomer selected from the group consisting of N-methylolacrylamide, acrylamide, hydroxymethylated diacetone acrylamide, hydroxymethyl acrylate, hydroxymethyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, glycidyl acrylate and glycidyl methacrylate to effect crosslinking of said polymer.
Claim 4
Dependent Claim
32 words
The composition of claim 1 wherein said vinyl polymer contains 2 to 6 percent, by weight of the emulsion polymer solids, of urea-formaldehyde or melamine formaldehyde to effect crosslinking of said polymer.
Claim 5
Dependent Claim
28 words
The composition of claim 1 wherein the hydrocolloid stabilizer is selected from the group consisting of polyvinyl alcohol, hydroxyethyl cellulose, polymethyl vinyl ether of maleic anhydride and polyacrylamide.
Claim 6
Dependent Claim
26 words
The composition of claim 1 wherein said part B is present in an amount of 0.5 to 10 percent, by weight of the emulsion polymer solids.
Claim 7
Dependent Claim
67 words
The composition of claim 1 wherein said Part A is comprised of a polyvinyl alcohol stabilized vinyl acetate-n-methylolacrylamide copolymer, and said Part B is comprised of from 0.5 to 10 percent, by weight of the emulsion polymer solids, of a polysiloxane having a structure defined by formula I of claim 5 or an organofunctional silicone having a structure defined by formula II(a) or II(b) of claim 5.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |