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US3630831A
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Binding agent for nonwoven materials and nonwoven material made therewith
Assignee: KONINKLIJKE PAPIERFABRIEKEN VAN GELDER ZONEN NV
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Filing: 1968-10-28
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Granted: 1971-12-28
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Expires: 1988-10-28
Abstract
Abstract A suspension of a binding agent for nonwoven materials is prepared by dispersing particles of a polymer swellable in cold water and soluble in warm water such as starch or polyvinyl alcohol in a solution of a cross-linking agent such as formaldehyde and a cross-linking catalyst such as hydrochloric acid wherein the particles swell and substantially completely absorb the solution. This mass is maintained at substantially room temperature until the cross-linking agent partially reacts and thereafter the dispersion is diluted. The diluted dispersion may be partially neutralized to a pH at which the cross-linking agent is substantially prevented from reacting with the polymer. The binding agent is dispersed in a fiber dispersion and a web is formed which is thereafter heated to at least 140* C. to complete the cross-linking of the polymer.
Inventors
- 👤 Hendrik Jongetjes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:43
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/003; C08B15/00; C08B15/10; C08B37/00; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/38
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
32 words
The process of claim 1 wherein the diluted dispersion of swollen particles is partially neutralized until the pH of the suspension is such that the cross-linking agent is substantially prevented from reacting.
Claim 2
Dependent Claim
29 words
The process according to claim 1 wherein the cross-linking agent is an aldehyde or a synthetic resin precondensate obtained by reaction of an aldehyde with a nitrogen containing compound.
Claim 3
Dependent Claim
13 words
The process according to claim 1 in which the cross-linking agent is trimethylolmelamine.
Claim 4
Dependent Claim
24 words
The process according to claim 1 wherein the cross-linking agent is used in an amount of 5-25 percent by weight based on the polymer.
Claim 5
Dependent Claim
29 words
The process according to claim 1 wherein the particles of the polymer are caused to swell in a solution containing 1 percent-25 percent by weight of the cross-linking agent.
Claim 6
Dependent Claim
21 words
The process according to claim 1 wherein the cross-linking catalyst is selected from the group consisting of organic and inorganic acids.
Claim 7
Dependent Claim
27 words
The process according to claim 1 wherein the catalyst is used in an amount of 0.025 percent-0.5 percent by weight based on the amount of cross-linking agent.
Claim 8
Dependent Claim
16 words
A suspension of binding agent for nonwoven materials produced according to the process of claim 1.
Claim 9
Dependent Claim
49 words
The process for producing bound nonwoven materials comprising dispersing the suspension of claim 9 in a suspension of fibers in water, depositing this mixed suspension and removing water therefrom to form a web, drying the nonwoven web and heating the same at a temperature of at least 140* C.
Claim 10
Dependent Claim
28 words
A process according to claim 10 wherein 15 percent-30 percent by weight of binding agent calculated as dry material on the dry fibers is deposited in said web.
Claim 11
Dependent Claim
12 words
A bound nonwoven web produced according to the process of claim 10.
Claim 12
Dependent Claim
17 words
A bound nonwoven web according to claim 12, wherein the fibers of the web are glass fibers.
Claim 13
Dependent Claim
18 words
A bound nonwoven web according to claim 12, wherein the fibers of the web are regenerated cellulose fibers.
Claim 14
Dependent Claim
18 words
A bound nonwoven web according to claim 12, wherein the fibers of the web are synthetic polymer fibers.
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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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |