US4234467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binder for pressure sensitive adhesive
Assignee: Hoechst Perstorp AB
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Filing: 1979-02-22
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Granted: 1980-11-18
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Expires: 1999-02-22
Abstract
Abstract Binder for a pressure sensitive adhesive, characterized in that it exists as a polymer dispersed in water and obtained by emulsion polymerization of: (A) 65.0-99.4 percent by weight of one or more acrylic esters with 4-18, preferably 6-10 carbon atoms in the alcohol part of the ester, the esters being selected in such a way that a polymerization of only these esters gives a tacky polymer with a Tg-value below 0 DEG C., preferably below -20 DEG C. (B) 2.0-0.1 percent by weight of a polymerizable compound with the formula <IMAGE> or with the formula <IMAGE> wherein R1, R2, R3 and R4 are as defined in the specification (C) 5.0-0.5 percent by weight of at least one ethylenically unsaturated acid such as acrylic acid, methacrylic acid or itaconic acid and (D) 28.0-0 percent by weight of one or more compounds selected from the group consisting of alkyl- or hydroxyalkyl acrylate or a lower alkyl or hydroxyalkyl methacrylate with 1-3 carbon atoms in the alcohol part of the ester, acrylonitrile or styrene.
Inventors
- 👤 Lars-Olof Ryrfors
- 👤 Mats S. O. Hassander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:00
CPC Classifications
C; C09; C09J; C09J133/00; C09J133/04; C09J133/06; C09J133/08; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/16; C08F220/18; C08F220/1808; C09J2301/00; C09J2301/30; C09J2301/302; Y; Y10; Y10S; Y10S526/00; Y10S526/931
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
230 words
Process for the production of a binder for a pressure sensitive adhesive by emulsion polymerization of: (A) 65-99.4 percent by weight of at least one acrylic ester with 4-18 carbon atoms in the alcohol part of the ester, the esters being selected whereby polymerization of only the selected esters produces a tacky polymer with a Tg-value below 0° C.; (B) 0.1 to 2 percent by weight of a polymerizable compound selected from the group consisting of a compound of the formula ##STR6## where R 1 =H or CH 3 , R 2 =H or ##STR7## and R 3 =CH 3 , C 2 H 5 , OH, CH 2 OH or ##STR8## or a compound with the formula ##STR9## where R 4 =CH 3 or CH 2 CH=CH 2 (C) 5-0.5 percent by weight of at least one ethylenically unsaturated acid and (D) 28-0 percent by weight of one or more compounds selected from the group consisting of an alkyl acrylate, a hydroxyalkyl acrylate, a lower alkyl methacrylate, a hydroxyalkyl methacrylate with 1-3 carbon atoms in the alcohol part of the ester, acrylonitrile or styrene, said process comprising first copolymerizing the compounds from the groups (A), (C) and (D) in water at a temperature of about 40°-90° C. for 1/4 to 7/8 of the total reaction time, and then mixing therewith a compound from group (B) and completing the reaction.
Claim 2
Dependent Claim
230 words
Process for the production of a binder for a pressure sensitive adhesive by emulsion polymerization of: (A) 65-99.4 percent by weight of at least one acrylic ester with 4-18 carbon atoms in the alcohol part of the ester, the esters being selected whereby polymerization of only the selected esters produces a tacky polymer with a Tg-value below 0° C.; (B) 0.1 to 2 percent by weight of a polymerizable compound selected from the group consisting of a compound of the formula ##STR6## where R 1 =H or CH 3 , R 2 =H or ##STR7## and R 3 =CH 3 , C 2 H 5 , OH, CH 2 OH or ##STR8## or a compound with the formula ##STR9## where R 4 =CH 3 or CH 2 CH=CH 2 (C) 5-0.5 percent by weight of at least one ethylenically unsaturated acid and (D) 28-0 percent by weight of one or more compounds selected from the group consisting of an alkyl acrylate, a hydroxyalkyl acrylate, a lower alkyl methacrylate, a hydroxyalkyl methacrylate with 1-3 carbon atoms in the alcohol part of the ester, acrylonitrile or styrene, said process comprising first copolymerizing the compounds from the groups (A), (C) and (D) in water at a temperature of about 40°-90° C. for 1/4 to 7/8 of the total reaction time, and then mixing therewith a compound from group (B) and completing the reaction.
Claim 3
Dependent Claim
40 words
The process of claim 1 wherein the compounds from the groups (A), (C) and (D) are first copolymerized for 1/2 to 4/5 of the total reaction time, the compounds from group (B) are mixed therewith, and the reaction is completed.
Claim 4
Dependent Claim
16 words
The process of claim 1 or 2 wherein the total reaction time is about 4 hours.
Claim 5
Dependent Claim
59 words
The process of claim 1 or 2 wherein 78-98.9 percent by weight of one or more compounds from group (A), 1-0.1 percent by weight of one or more compounds from group (B), 3-1 percent by weight of at least one compound from group (C) and 18-0 percent by weight of one or more compounds from group (D) are copolymerized.
Claim 6
Dependent Claim
59 words
The process of claim 1 or 2 wherein A is ethylhexyl acrylate, butyl acrylate, ethyl acrylate or a mixture thereof, B is trimethylol propane triacrylate, trimethylol propane trimethacrylate, pentaerythritol triacrylate, tetraallyloxy ethane or a mixture thereof, C is at least one of the compounds acrylic acid or methacrylic acid, and D is acrylonitrile, methyl acrylate, methyl methacrylate or styrene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |