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US 6,884,830 B1Granted
Flexible setting joint compound and method for making flexible joints
AssigneeAir Products Polymers, L.P.
InventorE. Chris Hornaman
Life of this patent
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Abstract
A flexible setting type hydraulic joint compound and a method of forming flexible joints. The flexible joint compound of this invention primarily contains 2 to 20 parts by weight of an emulsion polymer having a Tg that is less than about −40° C., and 22 to 44 parts by weight of total water, based on 100 parts by weight calcium sulfate hemihydrate filler. It can be applied to joints between two adjacent sheets of gypsum board to form a flexible joint that is resistant to cracking.
Claims12
A flexible setting joint compound comprising,
- for each 100 parts by weight calcium sulfate hemihydrate:
- 2 to 20 parts by weight (solids) of an emulsion polymer having a Tg of less than about −40° C.;
- 26 to 44 parts by weight total water;
- 0 to 20 parts by weight inert filler;
- 0 to 5 parts by weight additional surfactant;
- and
- 0 to 5 parts by weight of an accelerator.
4 more elements
A method for producing flexible joints comprising:
- a) supplying a first planar substrate having a first edge;
- b) abutting a second edge of a second planar substrate against said first edge of the first planar substrate, thereby forming a joint;
- c) applying a setting hydraulic joint compound to the joint, said joint compound comprising,
- for each 100 parts by weight calcium sulfate hemihydrate:
- 2 to 20 parts by weight (solids) of an emulsion polymer having a Tg of less than about −40° C.;
- 26 to 44 parts by weight total water;
- 0 to 20 parts by weight inert filler;
- 0 to 5 parts by weight additional surfactant;
- and
- 0 to 5 parts by weight of an accelerator;
- d) allowing the joint compound to set.
8 more elements
Dependencies are inferred from the claim text.