Patent US4696965A successfully refreshed from Google Patents.
US4696965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide-acrylic blends
Assignee: 3M Co
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Filing: 1985-07-23
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Granted: 1987-09-29
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Expires: 2005-07-23
Abstract
Abstract Pressure sensitive adhesives comprise blends of polyamides with polyacrylates. The resultant blends are particularly suited for use in pressure sensitive adhesive tapes. Films, articles, and coated articles containing these pressure sensitive adhesives are also disclosed.
Inventors
- 👤 Jerald K. Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:31
CPC Classifications
C; C09; C09J; C09J177/00; C09J133/00; C09J133/04; C09J133/06; C09J177/06; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/14; C08L77/00; C09J2301/00; C09J2301/30; C09J2301/302
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
64 words
A composition of matter comprising a blend comprising: (1) at least one condensation-based polyamide prepared by reaction of stoichiometric amounts of acid and amine functionality, and (2) at least one pressure sensitive acrylic polymer, the ratio by weight of the acrylic and polyamide polymers being 99.99:0.01 to 0.01:99.99, said blend being only organic solvent soluble and said blend being an uncrosslinked pressure sensitive adhesive.
Claim 2
Dependent Claim
64 words
A composition of matter comprising a blend comprising: (1) at least one condensation-based polyamide prepared by reaction of stoichiometric amounts of acid and amine functionality, and (2) at least one pressure sensitive acrylic polymer, the ratio by weight of the acrylic and polyamide polymers being 99.99:0.01 to 0.01:99.99, said blend being only organic solvent soluble and said blend being an uncrosslinked pressure sensitive adhesive.
Claim 3
Dependent Claim
16 words
The composition according to claim 1 wherein said blend further comprises at least one organic solvent.
Claim 4
Dependent Claim
15 words
The composition according to claim 1 comprising at least 50% by weight of acrylic polymer.
Claim 5
Dependent Claim
23 words
The composition according to claim 1 wherein the weight ratios of acrylic and polyamide polymers is in the range of 7:1 to 2:1.
Claim 6
Dependent Claim
19 words
The composition according to claim 1 wherein said polyamide is the reaction product of a polyamine with a polyacid.
Claim 7
Dependent Claim
13 words
The composition according to claim 1 wherein said polyamide incorporates polymerized fatty acid.
Claim 8
Dependent Claim
33 words
The composition according to claim 1 wherein said polyamide is the reaction product of monomers or polymers which have amine-acid functionality in the same monomer or polymer in a free or latent form.
Claim 9
Dependent Claim
16 words
The composition according to claim 1 wherein said polyamide is derived from lactams or amino acids.
Claim 10
Dependent Claim
33 words
The composition according to claim 2 wherein said solvent is at least one of an aromatic or aliphatic hydrocarbon, a C 1 to C 4 alkanol, a chlorinated organic solvent, or combinations thereof.
Claim 11
Dependent Claim
24 words
The composition according to claim 1 wherein said acrylic polymer is the copolymerization product of a long chain alkyl acrylate and a polar comonomer.
Claim 12
Dependent Claim
40 words
The composition according to claim 1 wherein said acrylic polymer is an acrylic ester of a non-tertiary alkyl alcohol having 4 to 12 carbon atoms in which the polar comonomer is acrylic acid, methacrylic acid, acrylamide, or an N-acryloylamino acid.
Claim 13
Dependent Claim
74 words
The composition according to claim 1 wherein said polyamide comprises the copolymerization product of: (a) 57.5 to 94.75 mole percent short chain polyamide-forming species; (b) 5 to 30 mole percent polyamide-forming dimer acid; (c) 0.25 to 12.5 mole percent amorphous polyamide forming oligomers having a number average molecular weight in the range of about 600 to about 10,000; and said acrylic polymer comprises the copolymerization product of: (a) isooctyl acrylate and (b) acrylic acid.
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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) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |