US4042409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water repellent gypsum composition
Assignee: Yoshino Gypsum Co Ltd
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Filing: 1976-04-01
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Granted: 1977-08-16
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Expires: 1996-04-01
Abstract
Abstract A water repellent gypsum composition comprising a gypsum, and a paraffin emulsion prepared by emulsifying (a) paraffin hydrocarbon having a melting point of 40 DEG -80 DEG C and (b) an oxidized paraffin having an acid value of 10-70 at a ratio of from 97:3 to 50:50 by weight, respectively, in the presence of a water soluble alkali compound. Optionally, a polymer emulsion or solution may be added.
Inventors
- 👤 Ichiro Terada
- 👤 Tadashi Yamada
- 👤 Michio Nishi
- 👤 Mitsuo Uchida
- 👤 Naomasa Sugiyama
- 👤 Mamoru Kaneko
- 👤 Nobuhiko Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:09
CPC Classifications
B; B32; B32B; B32B13/00; B32B13/04; B32B13/08; C; C04; C04B; C04B28/00; C04B28/14; B32B2305/00; B32B2305/30; B32B2307/00; B32B2307/10; B32B2307/102; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2419/00; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/0062; C04B2111/20; C04B2111/27
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
82 words
A water repellent gypsum composition, which consists essentially of: a mixture of 100 parts by weight of a gypsum material per 1-20 parts by weight based on the solids content of a paraffin emulsion prepared by emulsifying A. a paraffin hydrocarbon having a melting point of 40°-80° C and b. an oxidized paraffin having an acid value of 10-70 at a ratio of from 97:3 to 50:50 by weight, respectively in the presence of a water soluble alkali or ammonium ion base.
Claim 2
Dependent Claim
82 words
A water repellent gypsum composition, which consists essentially of: a mixture of 100 parts by weight of a gypsum material per 1-20 parts by weight based on the solids content of a paraffin emulsion prepared by emulsifying A. a paraffin hydrocarbon having a melting point of 40°-80° C and b. an oxidized paraffin having an acid value of 10-70 at a ratio of from 97:3 to 50:50 by weight, respectively in the presence of a water soluble alkali or ammonium ion base.
Claim 3
Dependent Claim
21 words
The water repellent gypsum composition of claim 1, wherein the melting point of the oxidized paraffin is 30° - 90° C.
Claim 4
Dependent Claim
27 words
The water repellent gypsum composition of claim 1, wherein the water soluble alkali or ammonium ion base is an alkali metal hydroxide or carbonate or ammonium hydroxide.
Claim 5
Dependent Claim
23 words
The water repellent gypsum composition of claim 1, wherein an emulsifier is added in the emulsification of said paraffin hydrocarbon and oxidized paraffin.
Claim 6
Dependent Claim
47 words
The water repellent gypsum composition of claim 4, wherein the emulsifier is a nonionic surfactant, and the amount of the emulsifier is in the range of 0 - 5 wt. parts per 100 wt. parts of the total amount of the paraffin hydrocarbon and the oxidized paraffin.
Claim 7
Dependent Claim
77 words
A water repellent gypsum composition, which consists essentially of: a mixture of said gypsum, and said paraffin emulsion of claim 1 and a polymer emulsion or solution, wherein the weight ratio of the solid components of said paraffin emulsion to said polymer emulsion or solution ranges from 95:5 to 40:60, and wherein said polymer of said polymer emulsion is an acrylic acid ester polymer, a vinyl acetate homopolymer or copolymer, a urea polymer or an asphalt emulsion.
Claim 8
Dependent Claim
25 words
The water repellent gypsum composition of claim 6, wherein the polymer emulsion or solution has the minimum film forming temperature of less than 80° C.
Claim 9
Dependent Claim
38 words
The water repellent gypsum composition of claim 6, wherein a nonionic surfactant is added to the polymer emulsion or solution at a ratio of 1 - 10 wt. parts per 100 wt. parts of the polymer solid component.
Claim 10
Dependent Claim
18 words
A gypsum product which is prepared by casting and setting the water repellent gypsum composition of claim 1.
Claim 11
Dependent Claim
19 words
The gypsum product of claim 9, wherein surface paper is adhered before the water repellent gypsum composition is hardened.
Claim 12
Dependent Claim
26 words
A method of forming a water repellent gypsum composition which comprises emulsifying the paraffin emulsion composition of claim 1 and adding the emulsion to a gypsum.
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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) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |