US4603077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-absorbing laminate and production process thereof
Assignee: Tokyo Serofan Co Ltd
•
Filing: 1985-04-02
•
Granted: 1986-07-29
•
Expires: 2005-04-02
Abstract
Abstract A water-absorbing laminate comprising a water-absorbing film and a non-woven fabric, in which the water-absorbing film is formed by film-forming a mixture of (A) a water-soluble polymer containing, as the monomer component, at least 40 mole % of an alpha , beta -unsaturated compound containing one or two carboxyl groups or groups from which a carboxyl group can be easily derived and in which 5% to 50% of the carboxyl groups and/or groups from which a carboxyl group can be easily derived are in the form of a salt, and (B) polyvinyl alcohol in a weight ratio of (A)/(B) of not less than 1/99 to less than 1/9. This water-absorbing can be produced by laminating the water-absorbing film on the non-woven fabric under pressure either in a hydrous and heat-softened state of the film or through an adhesive and, optionally, heat-treating the resultant laminate. This water-absorbing laminate can avoid the formation of excessive moisture and prevent waterdrops from dropping while keeping the heat-retaining properties, when used as a sheet for a cover culture. As a result, the occurrence of disease in the plants under culture and any reduction in the yield and quality of the plants are effectively prevented.
Inventors
- 👤 Yoshimasa Fujimoto
- 👤 Hirotoshi Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:32
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; A; A01; A01G; A01G13/00; A01G13/20; A01G13/24; A01G9/00; A01G9/14; A01G9/1438; B32B27/30; B32B27/306; B32B38/00; B32B38/0036; B32B5/00; B32B5/02; B32B5/022; B32B7/00; B32B7/04; B32B7/12; B32B2307/00; B32B2307/70; B32B2307/726; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/25; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31909; Y10T428/31928; Y10T442/00; Y10T442/20; Y10T442/2025; Y10T442/2484; Y10T442/60; Y10T442/674; Y10T442/675
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
A water-absorbing laminate comprising a water-absorbing film and a nonwoven fabric, said water-absorbing film being formed by film-forming a mixture of (A) a water-soluble polymer containing, as the monomer component, at least 40 mole % of an α,β-unsaturated compound containing one or two carboxyl groups or groups from which a carboxyl group can be easily derived and in which 5% to 50% of the carboxyl groups and/or groups from which a carboxyl group can be easily derived are in the form of a salt, and (B) polyvinyl alcohol in a weight ratio of (A)/(B) of not less than 1/99 to less than 1/9.
Claim 2
Dependent Claim
103 words
A water-absorbing laminate comprising a water-absorbing film and a nonwoven fabric, said water-absorbing film being formed by film-forming a mixture of (A) a water-soluble polymer containing, as the monomer component, at least 40 mole % of an α,β-unsaturated compound containing one or two carboxyl groups or groups from which a carboxyl group can be easily derived and in which 5% to 50% of the carboxyl groups and/or groups from which a carboxyl group can be easily derived are in the form of a salt, and (B) polyvinyl alcohol in a weight ratio of (A)/(B) of not less than 1/99 to less than 1/9.
Claim 3
Dependent Claim
18 words
A laminate according to claim 1, wherein the water-soluble polymer (A) is an α-olefin-maleic acid-alkali metal maleate copolymer.
Claim 4
Dependent Claim
36 words
A laminate according to claim 1, wherein the nonwoven fabric is a nonwoven fabric composed of long or short fibers made of polyvinyl alcohol, acetalized polyvinyl alcohol, polyolefins, polyesters, polyamides, or acrylonitrile-type polymers or natural fiber.
Claim 5
Dependent Claim
17 words
A laminate according to claim 1, wherein the water-absorbing laminate is a sheet for a cover culture.
Claim 6
Dependent Claim
128 words
A process for producing a water-absorbing laminate which comprises laminating a film on a nonwoven fabric under pressure either in a hydrous and heat-softened state of the film or through an adhesive and, optionally, heat-treating the resultant laminate, said film being formed by film-forming a mixture of (A) a water-soluble polymer containing, as the monomer component, at least 40 mole % of an α,β-unsaturated compound containing one or two carboxyl groups or groups from which a carboxyl group can be easily derived and in which 5% to 50% of the carboxyl groups and/or groups from which a carboxyl group can be easily derived are in the form of a salt, and (B) polyvinyl alcohol in a weight ratio (A)/(B) of not less than 1/99 to less than 1/9.
Claim 7
Dependent Claim
128 words
A process for producing a water-absorbing laminate which comprises laminating a film on a nonwoven fabric under pressure either in a hydrous and heat-softened state of the film or through an adhesive and, optionally, heat-treating the resultant laminate, said film being formed by film-forming a mixture of (A) a water-soluble polymer containing, as the monomer component, at least 40 mole % of an α,β-unsaturated compound containing one or two carboxyl groups or groups from which a carboxyl group can be easily derived and in which 5% to 50% of the carboxyl groups and/or groups from which a carboxyl group can be easily derived are in the form of a salt, and (B) polyvinyl alcohol in a weight ratio (A)/(B) of not less than 1/99 to less than 1/9.
Claim 8
Dependent Claim
54 words
A process according to claim 5, wherein a film material in a hydrous and heat-softened state, which has been cast from an aqueous solution mixture of the water-soluble polymer (A) and the polyvinyl alcohol (B), is bonded to one surface of the nonwoven fabric under pressure and the laminate is then dried and heat-treated.
Claim 9
Dependent Claim
24 words
A process according to claim 6, wherein the cast film material in a hydrous and heat-softened state is a hydrous film immediately after casting.
Claim 10
Dependent Claim
46 words
A process according to claim 6, wherein the cast film material in a hydrous and heat-softened state is one obtained by adding water to a film which has been preliminarily dried after the casting and heating thereof or blowing heated water vapor against such a film.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |