US4745025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonwoven products bonded with binder emulsions of vinyl acetate/ethylene copolymers having improved solvent resistance
Assignee: Air Products and Chemicals Inc
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Filing: 1987-08-06
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Granted: 1988-05-17
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Expires: 2007-08-06
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 22:37
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F218/08; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/699
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
114 words
A nonwoven product comprising a nonwoven web of fibers bonded together with a vinyl acetate/ethylene copolymer binder deposited from an aqueous medium having colloidally dispersed therein a copolymer consisting essentially of vinyl acetate, 5-35 wt% ethylene and 2-10 wt% of an amide functional crosslinking comonomer which is N-methylolacrylamide or a comonomer of the formula R-NH-(CH.sub.2).sub.n -CH(OR').sub.2 where R is acryloyl or methacryloyl, R' is a C 1-C 4 alkyl group, and n is 3 or 4, the copolymer prepared by emulsion polymerization in the presence of 0.1 to 1 wt% polyvinyl pyrrolidone, based on vinyl acetate in the copolymer, at a binder add-on sufficient to bond the fibers together to form a self-sustaining web.
Claim 2
Dependent Claim
114 words
A nonwoven product comprising a nonwoven web of fibers bonded together with a vinyl acetate/ethylene copolymer binder deposited from an aqueous medium having colloidally dispersed therein a copolymer consisting essentially of vinyl acetate, 5-35 wt% ethylene and 2-10 wt% of an amide functional crosslinking comonomer which is N-methylolacrylamide or a comonomer of the formula R-NH-(CH.sub.2).sub.n -CH(OR').sub.2 where R is acryloyl or methacryloyl, R' is a C 1-C 4 alkyl group, and n is 3 or 4, the copolymer prepared by emulsion polymerization in the presence of 0.1 to 1 wt% polyvinyl pyrrolidone, based on vinyl acetate in the copolymer, at a binder add-on sufficient to bond the fibers together to form a self-sustaining web.
Claim 3
Dependent Claim
17 words
The nonwoven product of claim 1 in which the ethylene content of the copolymer is 10-20 wt%.
Claim 4
Dependent Claim
19 words
The nonwoven product of claim 1 in which the amide functional crosslinking comonomer is 3-7 wt% of the copolymer.
Claim 5
Dependent Claim
14 words
The nonwoven product of claim 1 in which the polyvinyl pyrrolidone is 0.2-0.7 wt%.
Claim 6
Dependent Claim
14 words
The nonwoven product of claim 1 in which the polyvinyl pyrrolidone is 0.25-0.5 wt%.
Claim 7
Dependent Claim
15 words
The nonwoven product of claim 1 in which the amide functional crosslinking comonomer is N-methylolacrylamide.
Claim 8
Dependent Claim
26 words
The nonwoven product of claim 1 in which the amide functional crosslinking monomer is a comonomer of the formula R-NH-(CH 2 ) n -CH(OR') 2 .
Claim 9
Dependent Claim
20 words
The nonwoven product of claim 7 in which R is acryloyl, R' is methyl or ethyl and n is 3.
Claim 10
Dependent Claim
19 words
The nonwoven product of claim 1 in which the binder add-on is 3 to 100 wt%, based on web.
Claim 11
Dependent Claim
19 words
The nonwoven product of claim 1 in which the binder add-on is 10 to 50 wt%, based on web.
Claim 12
Dependent Claim
116 words
A nonwoven product comprising a nonwoven web of fibers bonded together with a vinyl acetate/ethylene copolymer binder deposited from 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 the formula R-NH-(CH.sub.2).sub.n -CH(OR').sub.2 where R is acryloyl or methacryloyl, R' is a C 1 -C 4 alkyl group, and n is 3 or 4, the copolymer prepared by the emulsion polymerization in the presence of 0.2 to 0.7 wt% polyvinyl pyrrolidone, based on vinyl acetate in te copolymer, at a binder add-on sufficient to bond the fibers together to form a self-sustaining web.
Claim 13
Dependent Claim
116 words
A nonwoven product comprising a nonwoven web of fibers bonded together with a vinyl acetate/ethylene copolymer binder deposited from 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 the formula R-NH-(CH.sub.2).sub.n -CH(OR').sub.2 where R is acryloyl or methacryloyl, R' is a C 1 -C 4 alkyl group, and n is 3 or 4, the copolymer prepared by the emulsion polymerization in the presence of 0.2 to 0.7 wt% polyvinyl pyrrolidone, based on vinyl acetate in te copolymer, at a binder add-on sufficient to bond the fibers together to form a self-sustaining web.
Claim 14
Dependent Claim
14 words
The nonwoven product of claim 11 in which the polyvinyl pyrrolidone is 0.25-0.5 wt%.
Claim 15
Dependent Claim
15 words
The nonwoven product of claim 11 in which the amide functional crosslinking monomer is N-methylolacrylamide.
Claim 16
Dependent Claim
26 words
The nonwoven product of claim 11 in which the amide functional crosslinking monomer is a comonomer of the formula R-NH-(CH 2 ) n -CH(OR') 2 .
Claim 17
Dependent Claim
20 words
The nonwoven product of claim 14 in which R is acryloyl, R' is methyl or ethyl and n is 3.
Claim 18
Dependent Claim
14 words
The nonwoven product of claim 13 in which the polyvinyl pyrrolidone is 0.25-0.5 wt%.
Claim 19
Dependent Claim
19 words
The nonwoven product of claim 13 in which the binder add-on is 3 to 100 wt%, based on web.
Claim 20
Dependent Claim
19 words
The nonwoven product of claim 13 in which the binder add-on is 10 to 50 wt%, based on web.
Claim 21
Dependent Claim
19 words
The nonwoven product of claim 14 in which the binder add-on is 3 to 100 wt%, based on web.
Claim 22
Dependent Claim
19 words
The nonwoven product of claim 14 in which the binder add-on is 10 to 50 wt%, based on web.
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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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |