Patent US4657594A successfully refreshed from Google Patents.
US4657594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight joint compound
Assignee: USG Corp
•
Filing: 1985-07-05
•
Granted: 1987-04-14
•
Expires: 2005-07-05
Abstract
Abstract Expanded perlite coated with an amino-functional siloxane and a silicone wetting agent, and a joint compound incorporating same, which, when applied to gypsum wallboard, has improved bonding properties and greater uniformity in paint gloss appearance between the surface of the joint compound and the surface of the wallboard.
Inventors
- 👤 Arthur W. Struss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:00
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/1051; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C04B26/00; C04B26/02; C04B26/04; C04B2111/00; C04B2111/00474; C04B2111/00663; C04B2111/00672; Y; Y10; Y10S; Y10S106/00; Y10S106/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
30 words
Expanded perlite which has been treated with an amino-functional silicone compound to render it water-insensitive while still providing good bonding properties to a joint compound into which it is formulated.
Claim 2
Dependent Claim
30 words
Expanded perlite which has been treated with an amino-functional silicone compound to render it water-insensitive while still providing good bonding properties to a joint compound into which it is formulated.
Claim 3
Dependent Claim
16 words
A treated expanded perlite according to claim 1, wherein said amino-functional silicone compound is an aminosiloxane.
Claim 4
Dependent Claim
26 words
An expanded perlite compound according to claim 1, wherein said amino-functional silicone compound is formed from a mixture of an alkyl group-containing silane and an aminosilane.
Claim 5
Dependent Claim
27 words
An expanded perlite according to claim 1, additionally treated with a silicone wetting agent, thereby improving painting uniformity of a joint compound into which it is formulated.
Claim 6
Dependent Claim
125 words
A lightweight joint compound having properties suitable for use in finishing joints between the edges of adjacent wallboards, and having improved bonding to paper tape and paper cover sheets provided on said wallboard, said joint compound comprising: (1) a filler selected from the group consisting of calcium carbonate and calcium sulfate, (2) a non-leveling agent, (3) expanded perlite which has been treated with an amino-functional silicone compound to render said perlite water-insensitive and improving the joint compound to paper bond, said perlite being present in an amount of from about 3.5% to about 25% based on the dry weight of said joint compound, (4) a thickener, (5) a binder, and (6) sufficient water to adjust the viscosity to render said joint compound suitable for use.
Claim 7
Dependent Claim
125 words
A lightweight joint compound having properties suitable for use in finishing joints between the edges of adjacent wallboards, and having improved bonding to paper tape and paper cover sheets provided on said wallboard, said joint compound comprising: (1) a filler selected from the group consisting of calcium carbonate and calcium sulfate, (2) a non-leveling agent, (3) expanded perlite which has been treated with an amino-functional silicone compound to render said perlite water-insensitive and improving the joint compound to paper bond, said perlite being present in an amount of from about 3.5% to about 25% based on the dry weight of said joint compound, (4) a thickener, (5) a binder, and (6) sufficient water to adjust the viscosity to render said joint compound suitable for use.
Claim 8
Dependent Claim
15 words
A joint compound according to claim 5, wherein said aminofunctional silicone compound is an aminosiloxane.
Claim 9
Dependent Claim
25 words
A joint compound according to claim 5, wherein said aminofunctional silicone compound is formed from a mixture of an alkyl group-containing silane and an aminosilane.
Claim 10
Dependent Claim
27 words
A joint compound according to claim 5, additionally treated with a silicone wetting agent, thereby improving painting uniformity of a joint compound in which it is incorporated.
Claim 11
Dependent Claim
29 words
A lightweight joint compound according to claim 8, wherein said filler is present in an amount from about 38% to about 93% by dry weight of said joint compound.
Claim 12
Dependent Claim
14 words
A lightweight joint compound according to claim 8, wherein said filler is calcium carbonate.
Claim 13
Dependent Claim
14 words
A lightweight joint compound according to claim 8, wherein said filler is calcium sulfate.
Claim 14
Dependent Claim
31 words
A lightweight joint compound according to claim 8, wherein said non-leveling agent is present in an amount of from about 0.5% to about 7% by dry weight of said joint compound.
Claim 15
Dependent Claim
15 words
A lightweight joint compound according to claim 8, wherein said non-leveling agent is attapulgus clay.
Claim 16
Dependent Claim
29 words
A lightweight joint compound according to claim 8, wherein said non-leveling agent is a mixture of a clay and amylopectin starch in a ratio by weight of about 1:5.
Claim 17
Dependent Claim
30 words
A lightweight joint compound according to claim 8, wherein said binder is present in an amount of from about 0.5% to about 10% by dry weight of said joint compound.
Claim 18
Dependent Claim
14 words
A lightweight joint compound according to claim 8, wherein said binder is polyvinyl acetate.
Claim 19
Dependent Claim
23 words
A lightweight joint compound according to claim 8, wherein said thickener is present in an amount of from about 0.5% to about 1.8%.
Claim 20
Dependent Claim
14 words
A lightweight joint compound according to claim 8, wherein said thickener is hydroxypropyl methylcellulose.
Claim 21
Dependent Claim
13 words
A lightweight joint compound according to claim 8, wherein said thickener is hydroxyethylcellulose.
Claim 22
Dependent Claim
14 words
A lightweight joint compound according to claim 8, which is substantially free of mica.
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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |