Patent US4419481A successfully refreshed from Google Patents.
US4419481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small particle size latex useful as a pressure sensitive adhesive
Assignee: Dow Chemical Co
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Filing: 1982-11-01
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Granted: 1983-12-06
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Expires: 2002-11-01
Abstract
Abstract A pressure-sensitive adhesive is prepared by blending (1) a small particle size latex having a hard monomer (such as styrene), a soft monomer (such as butadiene) and, optionally, an acid (such as itaconic acid), and (2) a tackifying resin. These adhesives have an excellent combination of properties including peel adhesion and shear adhesion.
Inventors
- 👤 James E. Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:27
CPC Classifications
C; C09; C09J; C09J113/00; C09J113/02; C09J125/00; C09J125/02; C09J125/04; C09J125/08; C09J125/10; C08; C08L; C08L2666/00; C08L2666/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31931
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
109 words
A pressure-sensitive adhesive formulation comprising a blend of (a) an aqueous synthetic polymer latex comprising disperse polymer particles having a number average diameter of less than about 120 nm, as measured by hydrodynamic chromatography calibrated by electron microscopy, and which individually comprise: (i) a soft monomer, a homopolymer of which would have a glass transition temperature of less than about 25° C., in an amount to impart stickiness to the latex, (ii) a hard monomer, a homopolymer of which would have a glass transition temperature of greater than about 25° C., in an amount to impart strength to the latex; and (b) a tackifying amount of a tackifying resin.
Claim 2
Dependent Claim
109 words
A pressure-sensitive adhesive formulation comprising a blend of (a) an aqueous synthetic polymer latex comprising disperse polymer particles having a number average diameter of less than about 120 nm, as measured by hydrodynamic chromatography calibrated by electron microscopy, and which individually comprise: (i) a soft monomer, a homopolymer of which would have a glass transition temperature of less than about 25° C., in an amount to impart stickiness to the latex, (ii) a hard monomer, a homopolymer of which would have a glass transition temperature of greater than about 25° C., in an amount to impart strength to the latex; and (b) a tackifying amount of a tackifying resin.
Claim 3
Dependent Claim
17 words
The adhesive of claim 1 wherein the latex particles additionally comprise an ethylenically unsaturated carboxylic acid monomer.
Claim 4
Dependent Claim
61 words
The pressure-sensitive adhesive formulation of claim 2 wherein the latex particles individually comprise per 100 parts by weight of the polymer particle: (a) from about 30 to about 90 parts of a soft monomer; (b) from about 10 to about 70 parts of hard monomer; and (c) from about 0.05 to about 10 parts of an ethylenically unsaturated carboxylic acid monomer.
Claim 5
Dependent Claim
17 words
The pressure-sensitive adhesive formulation of claim 2 wherein the soft monomer is an open chain conjugated diene.
Claim 6
Dependent Claim
15 words
The pressure-sensitive adhesive formulation of claim 2 wherein the hard monomer is a monovinylidene aromatic.
Claim 7
Dependent Claim
24 words
The pressure-sensitive formulation of claim 2 wherein the soft monomer is an open chain conjugated diene and the hard monomer is a monovinylidene aromatic.
Claim 8
Dependent Claim
21 words
The pressure-sensitive adhesive formulation of claim 6 wherein the open chain conjugated diene is butadiene and the monovinylidene aromatic is styrene.
Claim 9
Dependent Claim
19 words
The pressure-sensitive adhesive formulation of claim 2 wherein the number average particle size is less than about 110 nm.
Claim 10
Dependent Claim
21 words
The pressure-sensitive adhesive formulation of claim 2 wherein the number average particle size is between about 120 and about 76 nm.
Claim 11
Dependent Claim
44 words
The pressure-sensitive adhesive formulation of claim 2 wherein the latex is present at from about 10 to about 99 weight parts on a solids basis and the tackifying resin is present at from about 1 to about 90 weight parts on a solids basis.
Claim 12
Dependent Claim
15 words
A pressure-sensitive adhesive article comprising a substrate coated with the adhesive formulation of claim 1.
Claim 13
Dependent Claim
15 words
A pressure-sensitive adhesive article comprising a substrate coated with the adhesive formulation of claim 3.
Claim 14
Dependent Claim
15 words
A pressure-sensitive adhesive article comprising a substrate coated with the adhesive formulation of claim 7.
Claim 15
Dependent Claim
15 words
A pressure-sensitive adhesive article comprising a substrate coated with the adhesive formulation of claim 9.
Claim 16
Dependent Claim
15 words
A pressure-sensitive adhesive article comprising a substrate coated with the adhesive formulation of claim 10.
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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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |