Back to results
US 4,454,267 AGranted
Lightweight joint compound
AssigneeUnited States Gypsum Company
InventorTerrance L. Williams
Life of this patent
Estimating the term…
Abstract
A lightweight joint compound for use in finishing joints between gypsum wallboards, comprising a filler, a binder, a specially treated expanded perlite, a non-leveling agent, and a thickener.
Claims28
A lightweight joint compound having properties suitable for use in finishing joints between the edges of adjacent wallboards, said joint compound consisting essentially of:
- (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 a silicone compound to render it water-insensitive 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.
3 more elements
A method of joining the edges of adjacent gypsum wallboard panels which comprises:
- A. applying a lightweight joint compound over said edges consisting essentially of:
- (1) a filler selected from the group consisting of calcium carbonate and calcium sulfate,
- (2) a non-leveling agent,
- (3) expanded perlite treated with a silicone compound to render it water-insensitive, in an amount of from about 3.5% to about 25% of the dry weight of said joint compound,
- (4) a thickener,
- (5) a binder, and
- (6) water,
- B. permitting said joint compound to dry, and
- C. sanding said joint compound to achieve a smooth joint.
6 more elements
Dependencies are inferred from the claim text.