US4370433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength diene/monovinyl aromatic copolymer-based adhesives
Assignee: TotalEnergies Onetech Belgium SA
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Filing: 1981-07-10
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Granted: 1983-01-25
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Expires: 2001-07-10
Abstract
Abstract A highly branched copolymer particularly suitable for forming pressure sensitive adhesives prepared in the presence of specified amounts of tert-butylchloride. Conjugated diene monomers are copolymerized with monovinylaromatic monomers in the presence of an organolithium initiator and a suitable amount of tertiary butylchloride. The holding power of adhesives prepared thereby is greatly increased.
Inventors
- 👤 George M. Allison, III
- 👤 Mason S. Wilt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:45
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022; C09; C09J; C09J153/00; C09J153/02; C08L; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
97 words
A method for producing a branched copolymer comprising copolymerizing conjugated diene monomers and monovinylaromatic monomers using a monolithium initiator and then reacting the resulting lithium terminated polymer segments with a coupling agent having at least three functional groups capable of reacting with the resulting lithium terminated polymer segments to couple said coupling agent and the lithium terminated polymer segments, said method being further characterized in that the copolymerization is carried out in the presence of an amount of tertiary butylchloride that will improve the holding power that the polymer will impart to a pressure sensitive adhesive composition.
Claim 2
Independent Claim
97 words
A method for producing a branched copolymer comprising copolymerizing conjugated diene monomers and monovinylaromatic monomers using a monolithium initiator and then reacting the resulting lithium terminated polymer segments with a coupling agent having at least three functional groups capable of reacting with the resulting lithium terminated polymer segments to couple said coupling agent and the lithium terminated polymer segments, said method being further characterized in that the copolymerization is carried out in the presence of an amount of tertiary butylchloride that will improve the holding power that the polymer will impart to a pressure sensitive adhesive composition.
Claim 3
Dependent Claim
35 words
A method according to claim 1 wherein the tertiary butylchloride is employed in an amount in the range of about 30 to about 165 parts by weight per million parts by weight of total comonomers.
Claim 4
Dependent Claim
67 words
A method according to claim 2 wherein said branched copolymer is a branched block copolymer produced by reacting monovinylaromatic comonomer with the organolithium initiator until substantially all of the aromatic comonomer is polymerized, then adding to the resulting lithium terminated polymer conjugated diene comonomer, continuing the polymerization until substantially all of the diene comonomer is polymerized and then adding the coupling agent to form the coupled copolymer.
Claim 5
Dependent Claim
41 words
A process according to claim 3 wherein the copolymer has a molecular weight in the range of about 100,000 to about 500,000 and the ratio of conjugated diene to monovinylaromatic monomer is in the range of about 50/50 to about 90/10.
Claim 6
Dependent Claim
15 words
A process according to claim 4 wherein a copolymer of styrene and 1,3-butadiene is formed.
Claim 7
Dependent Claim
19 words
A process according to claim 5 wherein the organolithium initiator comprises n-butyllithium and said coupling agent comprises silicon tetrachloride.
Claim 8
Dependent Claim
34 words
A process according to claim 6 wherein the weight ratio of 1,3-butadiene to styrene is 70/30 and about 0.1 part by weight of n-butyllithium is employed per hundred parts by weight of total comonomers.
Claim 9
Dependent Claim
19 words
A pressure sensitive adhesive composition comprising tackifier, solvent, and a copolymer produced according to any one of claims 1-7.
Claim 10
Dependent Claim
24 words
An adhesive in accordance with claim 8 wherein said tackifier is selected from the group consisting of rosin esters, α-pinene, resins, and hydrocarbon resins.
Claim 11
Dependent Claim
23 words
An adhesive in accordance with claim 9 wherein said copolymer has a molecular weight in the range of about 150,000 to about 300,000.
Claim 12
Dependent Claim
41 words
An adhesive in accordance with claim 10 wherein said copolymer is a block branched copolymer of styrene and 1,3-butadiene and said tackifier is a glycerol rosin acid ester and said copolymer and said tackifier are employed at equal parts by weight.
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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) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |