US4698384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonwoven binder emulsions of vinyl acetate/ethylene copolymers having improved solvent resistance
Assignee: Air Products and Chemicals Inc
•
Filing: 1986-02-19
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Granted: 1987-10-06
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Expires: 2006-02-19
Abstract
Abstract A copolymer emulsion for bonding nonwoven products comprising an aqueous medium having colloidally dispersed therein a copolymer consisting essentially of vinyl acetate, 5-35 wt % ethylene and 2 to 10 wt % of an amide functional crosslinking comonomer which is N-methylolacrylamide or a compound of the formula R--NH--(CH 2 ) n --CH(OR') 2 where R is (meth)acryloyl, R' is a C 1 -C 4 alkyl group and n is 3 or 4, the copolymer emulsion prepared in the presence of 0.1 to 1 wt % polyvinyl pyrrolidone, based on vinyl acetate in the copolymer. Such emulsion binder copolymers demonstrate improved solvent resistance.
Inventors
- 👤 Chung-Ling Mao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:57
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F218/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
94 words
In a copolymer emulsion comprising an aqueous medium having colloidally dispersed therein a copolymer consisting essentially of vinyl acetate, 5-35 wt % ethylene and 2 to 10 wt % of an amide functional crosslinking comonomer which is N-methylolacryl-amide or a comonomer of formula I R--NH--(CH.sub.2).sub.n --CH(OR').sub.2 (I) where R is acryloyl or methacryloyl, R' is a C 1-C 4 alkyl group, and n is 3 or 4, the improvement comprising the preparation of the copolymer emulsion in the presence of 0.1 to 1 wt % polyvinyl pyrrolidone, based on vinyl acetate in the copolymer.
Claim 2
Dependent Claim
94 words
In a copolymer emulsion comprising an aqueous medium having colloidally dispersed therein a copolymer consisting essentially of vinyl acetate, 5-35 wt % ethylene and 2 to 10 wt % of an amide functional crosslinking comonomer which is N-methylolacryl-amide or a comonomer of formula I R--NH--(CH.sub.2).sub.n --CH(OR').sub.2 (I) where R is acryloyl or methacryloyl, R' is a C 1-C 4 alkyl group, and n is 3 or 4, the improvement comprising the preparation of the copolymer emulsion in the presence of 0.1 to 1 wt % polyvinyl pyrrolidone, based on vinyl acetate in the copolymer.
Claim 3
Dependent Claim
18 words
The copolymer emulsion of claim 1 in which the ethylene content of the copolymer is 10-20 wt %.
Claim 4
Dependent Claim
20 words
The copolymer emulsion of claim 1 in which the amide functional crosslinking comonomer is 3-7 wt % of the copolymer.
Claim 5
Dependent Claim
15 words
The copolymer emulsion of claim 1 in which the polyvinyl pyrrolidone is 0.2-0.7 wt %.
Claim 6
Dependent Claim
15 words
The copolymer emulsion of claim 1 in which the polyvinyl pyrrolidone is 0.25-0.5 wt %.
Claim 7
Dependent Claim
15 words
The copolymer emulsion of claim 1 in which the amide functional crosslinking comonomer is N-methylolacrylamide.
Claim 8
Dependent Claim
19 words
The copolymer emulsion of claim 1 in which the amide functional crosslinking comonomer is a comonomer of formula I.
Claim 9
Dependent Claim
20 words
The copolymer emulsion of claim 7 in which R is acryloyl, R' is methyl or ethyl and n is 3.
Claim 10
Dependent Claim
96 words
In a copolymer emulsion for bonding nonwovens comprising an aqueous medium having colloidally dispersed therein a copolymer consisting essentially of vinyl acetate, 10-20 wt % ethylene and 3-7 wt % of an amide functional crosslinking comonomer which is N-methylolacrylamide or a comonomer of formula I. R--NH--(CH.sub.2).sub.n --CH(OR').sub.2 (I) where R is acryloyl or methacryloyl, R' is a C 1 -C 4 alkyl group, and n is 3 or 4, the improvement comprising the preparation of the copolymer emulsion in the presence of 0.2 to 0.7 wt % polyvinyl pyrrolidone, based on vinyl acetate in the copolymer.
Claim 11
Dependent Claim
96 words
In a copolymer emulsion for bonding nonwovens comprising an aqueous medium having colloidally dispersed therein a copolymer consisting essentially of vinyl acetate, 10-20 wt % ethylene and 3-7 wt % of an amide functional crosslinking comonomer which is N-methylolacrylamide or a comonomer of formula I. R--NH--(CH.sub.2).sub.n --CH(OR').sub.2 (I) where R is acryloyl or methacryloyl, R' is a C 1 -C 4 alkyl group, and n is 3 or 4, the improvement comprising the preparation of the copolymer emulsion in the presence of 0.2 to 0.7 wt % polyvinyl pyrrolidone, based on vinyl acetate in the copolymer.
Claim 12
Dependent Claim
15 words
The copolymer emulsion of claim 9 in which the polyvinyl pyrrolidone is 0.25-0.5 wt %.
Claim 13
Dependent Claim
15 words
The copolymer emulsion of claim 9 in which the amide functional crosslinking comonomer is N-methylolacrylamide.
Claim 14
Dependent Claim
19 words
The copolymer emulsion of claim 9 in which the amide functional crosslinking comonomer is a comonomer of formula 1.
Claim 15
Dependent Claim
20 words
The copolymer emulsion of claim 12 in which R is acryloyl, R' is methyl or ethyl and n is 3.
Claim 16
Dependent Claim
15 words
The copolymer emulsion of claim 11 in which the polyvinyl pyrrolidone is 0.25-0.5 wt %.
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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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |