US3644252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive compositions containing styrene/isobutylene copolymer
Assignee: Velsicol Chemical LLC
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Filing: 1969-05-13
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Granted: 1972-02-22
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Expires: 1989-05-13
Abstract
Abstract This invention discloses a new hot-melt, pressure-sensitive adhesive composition comprising a primary polymer consisting of a solid, homogeneous and essentially random copolymer of styrene and isobutylene having a number average molecular weight of from about 1,000 to about 4,000, a heterogeneity index of from about 1.50 to about 2.25 and a styrene content of from about 40 to about 90 weight percent, and a secondary polymer selected from the group consisting of a copolymer of ethylene and vinyl acetate, a copolymer of ethylene and an alkyl acrylate, a polyvinyl-alkyl ether, a terpolymer of ethylene, vinyl acetate and acrylic acid, and a terpolymer of ethylene, vinyl acetate and methacrylic acid.
Inventors
- 👤 Richard S Shenfeld
- 👤 Frederick M Musser
- 👤 Girish U Kothari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:04
CPC Classifications
C; C09; C09J; C09J129/00; C09J129/10; C08; C08F; C08F10/00; C08K; C08K3/00; C08K3/01; C08K3/013; C08K5/00; C08K5/0008; C08K5/0016; C08L; C08L101/00; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L31/00; C08L31/02; C08L31/04; C08L33/00; C08L33/04; C08L33/06; C08L33/08; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C09J123/0846; C09J123/0853; C09J123/18; C09J123/20; C09J123/22; C09J125/00; C09J125/02; C09J125/04; C09J125/08; C09J131/00; C09J131/02; C09J131/04; C09J7/00; C09J7/30; C09J7/38; C09J7/381; C08L2205/00; C08L2205/03; C08L23/0846; C08L23/0853; C08L23/18; C08L23/20; C08L23/22; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/06; C08L2666/28; C08L2666/54; C08L29/00; C08L29/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
39 words
The composition of claim 1, wherein the copolymer (a) has a number average molecular weight of from about 1,200 to about 3, 500 and a ring and ball softening point of from about 140* F. to about 205* F.
Claim 2
Dependent Claim
17 words
The composition of claim 1, wherein the polymer (b) is the copolymer of ethylene and vinyl acetate.
Claim 3
Dependent Claim
18 words
The composition of claim 1, wherein the polymer (b) is the copolymer of ethylene and an alkyl acrylate.
Claim 4
Dependent Claim
21 words
The composition of claim 1, wherein the polymer (b) is the terpolymer of ethylene, vinyl acetate and acrylic or methacrylic acid.
Claim 5
Dependent Claim
16 words
The composition of claim 4, wherein the polymer is a copolymer of ethylene and isobutyl acrylate.
Claim 6
Dependent Claim
104 words
The composition of claim 1 wherein the copolymer of styrene and isobutylene is prepared by gradually contacting styrene and isobutylene in a proportion of from about 40 to 90 weight percent styrene at a polymerization temperature of from about 10* C. to about 50* C. in the presence of a hydrocarbon solvent with a catalyst system of an alkyl aluminum dihalide primary catalyst and at least one cocatalyst selected from the group consisting of water, an alcohol, an alkyl halide and a hydrogen halide, maintaining the styrene and isobutylene in reactive contact with the catalyst system for a time sufficient to insure complete polymerization.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |