Back to results
US 4,206,007 AGranted
Process for carpet manufacture
AssigneeWestvaco Corporation
InventorCarlton G. Force
Life of this patent
Estimating the term…
Abstract
An improved process is disclosed for manufacturing carpet. The improved process involves replacing from 4% to 25% of a carboxylated styrene-butadiene rubber carpet backing adhesive in a conventional carpet manufacturing process with a water soluble saponified tall oil pitch tackifier, thereby improving the bond strength between the carpet and backing.
Claims18
An improved process for the manufacture of carpet including the steps of
- (a) forming a mixture of up to 600 parts dry weight of filler material per 100 parts dry weight of carboxylated styrene-butadiene rubber latex,
- (b) adding an amount of a polyacrylate thickener sufficient to increase the viscosity of the mixture to from 15,000 to 20,000 centipoise,
- (c) coating evenly the bottom nonpile surface of a raw tufted carpet on a primary backing with the mixture,
- (d) applying a secondary backing material to the coated back side of the carpet by pressing with a roller, and
- (e) passing the thus formed carpet into a heating section whereby the primary backing and secondary backing materials are firmly bonded to each other and the base of each loop in the pile is firmly bonded to the primary backing,
- wherein the improvement comprises replacing from 4% to 25% of the rubber, prior to forming the mixture of step (a), with a saponified tall oil pitch tackifier, adding water to adjust the solids content of the rubber plus saponified tall oil pitch mixture to from 70% to 85% and the amount of the filler material added is up to 600 parts dry weight per 100 parts dry weight of the rubber plus saponified tall oil pitch.
3 more elements
An improved process for the manufacture of carpet including the steps of
- (a) forming a mixure of up to 600 parts dry weight of filler material per 100 parts dry weight of carboxylated styrene-butadiene rubber latex,
- (b) adding an amount of a polyacrylate thickener sufficient to increase the viscosity of the mixture to from 15,000 to 20,000 centipoise,
- (c) pre-coating evenly the bottom nonpile surface of a raw tufted carpet on a primary backing with the mixture,
- (d) passing the thus pre-coated carpet into a heating section whereby the base of each loop in the pile is firmly bonded to the primary backing,
- (e) applying a latex foam to the latex-coated underside of the carpet, and
- (f) passing the thus formed carpet into a heating section whereby the pre-coat and foam backings are firmly bonded to each other,
- wherein the improvement comprises replacing from 4% to 25% of the rubber, prior to forming the mixture of step (a), with a saponified tall oil pitch tackifier, adding water to adjust the solids content of the rubber plus saponified tall oil pitch mixture to from 70% to 85% and the amount of filler material added is up to 600 parts dry weight per 100 parts dry weight of the rubber plus saponified tall oil pitch.
4 more elements
Dependencies are inferred from the claim text.