US4419481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small particle size latex useful as a pressure sensitive adhesive
Assignee: Dow Chemical Co
•
Filing: 1982-11-01
•
Granted: 1983-12-06
•
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 03:01
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.
References Cited (Backward Citations)
US3432455A
Cited
US3574159A
Cited
US3759859A
Cited
US3869418A
Cited
US3756974A
Cited
US3970629A
Cited
US3793244A
Cited
US3966661A
Cited
US4001163A
Cited
US4069188A
Cited
US4130691A
Cited
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 |