US4145321A
Expired / Lapsed
US
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Pressure-sensitive adhesive compositions and process for preparing them
Assignee: Revertex Ltd
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Filing: 1977-11-14
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Granted: 1979-03-20
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Expires: 1997-11-14
Abstract
Abstract A pressure-sensitive adhesive composition with a low content of volatile liquids, such as organic solvents or water, comprises a maleinized liquid polybutadiene blended with one or more tackifying resins and one or more curing agents, suchas a blocked polyamine, the composition containing less than 20% by weight of volatile liquids. The liquid polybutadiene, which can be made by any conventional polymerization mechanism, is maleinized by reaction with meleic anhydride, and it is convenient to add the tackifying resin and any other ingredients of the composition to the maleinized liquid polybutadiene just after the maleinization reaction.
Inventors
- 👤 Cedric Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:40
CPC Classifications
C; C09; C09J; C09J113/00
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
65 words
A pressure-sensitive adhesive composition comprising a blend of: (a) the reaction product of maleic anhydride and a liquid polymer comprising at least a major proportion of butadiene, said reaction product comprising intact maleic anhydride units randomly distributed on the liquid polymer structure; (b) at least one solid tackifier resin; (c) at least one curing agent; and (d) less than 20% by weight of volatile liquid.
Claim 2
Dependent Claim
65 words
A pressure-sensitive adhesive composition comprising a blend of: (a) the reaction product of maleic anhydride and a liquid polymer comprising at least a major proportion of butadiene, said reaction product comprising intact maleic anhydride units randomly distributed on the liquid polymer structure; (b) at least one solid tackifier resin; (c) at least one curing agent; and (d) less than 20% by weight of volatile liquid.
Claim 3
Dependent Claim
14 words
A composition as claimed in claim 1, wherein the composition comprises a curing catalyst.
Claim 4
Dependent Claim
13 words
A composition as claimed in claim 1, wherein the volatile liquid is water.
Claim 5
Dependent Claim
19 words
A composition as claimed in claim 1, wherein the volatile liquid is an organic solvent for the tackifying resin(s).
Claim 6
Dependent Claim
23 words
A composition as claimed in claim 1, wherein, prior to maleinization, the average molecular weight of the liquid polybutadiene was 500 to 20,000.
Claim 7
Dependent Claim
23 words
A composition as claimed in claim 1, wherein, prior to maleinization, the average molecular weight of the liquid polybutadiene was 1,000 to 10,000.
Claim 8
Dependent Claim
25 words
A composition as claimed in claim 1, wherein, prior to maleinization, at least 45% of the units of the liquid polybutadiene were in the 1,4-configuration.
Claim 9
Dependent Claim
21 words
A composition as claimed in claim 1, wherein the tackifying resin(s) comprise(s) from 5 to 75% by weight of the composition.
Claim 10
Dependent Claim
21 words
A composition as claimed in claim 1, wherein the tackifying resin(s) comprise(s) from 25 to 55% by weight of the composition.
Claim 11
Dependent Claim
15 words
A composition as claimed in claim 1, wherein the curing agent is a blocked polyamine.
Claim 12
Dependent Claim
27 words
A composition as claimed in claim 1, wherein the composition additionally comprises one or more pigments, fillers, antioxidants, biocides, ordorants and other ingredients conventional in adhesive compositions.
Claim 13
Dependent Claim
24 words
A composition as claimed in claim 1, wherein the amount of maleic anhydride present provides from 1 to 6 anhydride groups per polybutadiene macromolecule.
Claim 14
Dependent Claim
14 words
A composition as claimed in claim 1, wherein said curing agent is a polyol.
Claim 15
Dependent Claim
14 words
A composition as claimed in claim 1, wherein said curing agent is an amide.
Claim 16
Dependent Claim
15 words
A composition as claimed in claim 1, wherein said curing agent is an alkanol amine.
Claim 17
Dependent Claim
15 words
A composition as claimed in claim 1, wherein said curing agent is an alkanol amide.
Claim 18
Dependent Claim
90 words
A process for preparing a pressure-sensitive adhesive composition comprising the steps of: (a) preparing a liquid polymer comprising at least a major proportion of butadiene; (b) reacting said liquid polymer with maleic anhydride in the absence of oxygen and ring opening substances to provide a reaction product comprising intact maleic anhydride units randomly distributed on the liquid polymer structure; and (c) blending said reaction product with at least one tackifier resin, and at least one curing agent to provide a composition containing less than 20% by weight of volatile liquid.
Claim 19
Dependent Claim
90 words
A process for preparing a pressure-sensitive adhesive composition comprising the steps of: (a) preparing a liquid polymer comprising at least a major proportion of butadiene; (b) reacting said liquid polymer with maleic anhydride in the absence of oxygen and ring opening substances to provide a reaction product comprising intact maleic anhydride units randomly distributed on the liquid polymer structure; and (c) blending said reaction product with at least one tackifier resin, and at least one curing agent to provide a composition containing less than 20% by weight of volatile liquid.
Claim 20
Dependent Claim
42 words
The process claimed in claim 17, wherein the liquid polybutadiene is maleinized in the presence of some or all of the tackifying resin(s), whereafter the remainder, if any, of the tackifying resin(s) and the curing agent(s) are blended with the maleinized material.
Claim 21
Dependent Claim
18 words
A process as claimed in claim 17, wherein one or more curing catalysts is blended into the composition.
Claim 22
Dependent Claim
20 words
A process as claimed in claim 17, wherein the average molecular weight of the liquid polybutadiene is 500 to 20,000.
Claim 23
Dependent Claim
20 words
A process as claimed in claim 17, wherein the average molecular weight of the liquid polybutadiene is 1,000 to 10,000.
Claim 24
Dependent Claim
18 words
A process as claimed in claim 17, wherein at least 45% of the liquid polybutadiene has the 1,4-configuration.
Claim 25
Dependent Claim
30 words
A process as claimed in claim 17, wherein the amount of maleic anydride employed in the maleinization is sufficient to provide from 1 to 6 anhydride groups per polybutadiene macromolecule.
Claim 26
Dependent Claim
30 words
A process as claimed in claim 17, wherein the amount of maleic anhydride employed in the maleinization is sufficient to provide from 1 to 3 anhydride groups per polybutadiene macromolecule.
Claim 27
Dependent Claim
15 words
A process as claimed in claim 17, wherein the curing agent is a blocked polyamine.
Claim 28
Dependent Claim
13 words
A process as claimed in claim 17, wherein said curing agent is polyol.
Claim 29
Dependent Claim
14 words
A process as claimed in claim 17, wherein said curing agent is an amide.
Claim 30
Dependent Claim
15 words
A process as claimed in claim 17, wherein said curing agent is an alkanol amine.
Claim 31
Dependent Claim
15 words
A process as claimed in claim 17, wherein said curing agent is an alkanol amide.
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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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |