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Patent US3784401A successfully refreshed from Google Patents.
US3784401A
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Process for impregnating non-wovens with butadiene carboxyl polymer latices
Assignee: Goodrich Corp
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Filing: 1972-07-14
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Granted: 1974-01-08
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Expires: 1992-07-14
Abstract
Abstract A process for obtaining nonwoven materials having improved physical properties, especially internal bond strength and resistance to delamination is provided. Nonwoven fabrics and papers impregnated with carboxyl-containing butadiene polymer latices, especially carboxylated butadienestyrene and carboxylated butadiene-acrylonitrile copolymer, are exposed to ammonia or amine vapors prior to the drying and curing operations to obtain the improved properties. Papers treated in this manner have shown a marked increase in internal bond strength.
Inventors
- 👤 G Wheelock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:36
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/18; D21H25/00; D21H25/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A process of claim 1 wherein the vinylidene comonomer (c) is selected from the group consisting of a vinyl aromatic, a vinyl or vinylidene halide, a vinyl ester, an Alpha , Beta -unsaturated nitrile, and an Alpha , Beta -unsaturated amide, and (d) is selected from the group consisting of acrylic and methacrylic acid in amount of about 0.1 to about 10 percent by weight of of carboxy groups.
Claim 2
Dependent Claim
44 words
The process of claim 2 wherein the latex is maintained at a pH below 7.5 during impregnation, in (2) the reaction time is from about 2 seconds to less than 5 minutes and in (3) the heating temperature is between 200* and 300* F.
Claim 3
Dependent Claim
48 words
The process of claim 3 wherein (a) is from about 50 to 70 percent by weight butadiene, (b) is from about 20 to 45 percent by weight acrylonitrile, there is up to about 40 percent by weight of vinylidene comonomer and about 1 to 5 weight percent (d).
Claim 4
Dependent Claim
48 words
The process of claim 3 wherein (a) is from about 50 to 70 percent by weight butadiene, (b) is from about 20 to 45 percent by weight styrene, there is up to about 40 percent by weight of vinylidene comonomer and about 1 to 5 weight percent (d).
Claim 5
Dependent Claim
10 words
The ptocess of claim 4 wherein (c) is methyl methacrylate.
Claim 6
Dependent Claim
30 words
The process of claim 4 wherein there is about 0.1 to 5 percent by weight of an acrylamide, methacrylamide or Alpha , Beta -ole-finically unsaturated N-alkylol amide of the formula
Claim 7
Dependent Claim
11 words
The process of claim 7 wherein the amide is N-methylol amide.
Claim 8
Dependent Claim
34 words
The process of claim 5 wherein the copolymer contains about 50 percent by weight butadiene, about 45 percent by weight styrene and about 1 to 5 percent by weight of acrylic and methacrylic acid.
Claim 9
Dependent Claim
36 words
The process of claim 6 wherein the copolymer contains about 55 percent by weight butadiene, about 20 percent by weight acrylonitrile, about 20 percent by weight methyl methacrylate and about 5 percent by weight methacrylic 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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |