Sizing composition for wet use chopped strand glass fibers
AssigneeOwens Corning Intellectual Capital, LLC
InventorsHelen Huang, Mohammed Tazi
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Abstract
A sizing composition including water, a polyvinylpyrrolidone film former, a silane coupling agent, a lubricant, and a surfactant is provided. The polyvinylpyrrolidone film former constitutes from 30 wt. % to 50 wt. % of the dry solids of the sizing composition. Wet use chopped strand glass fibers for use in reinforcing gypsum board are also provided. The wet use chopped strand glass fibers include chopped glass fibers having the sizing composition applied thereto. The sizing composition improves fiber bundle integrity, fiber flow rate, fiber flow rate consistency, and dispersibility of the wet use chopped strand glass fibers in a gypsum matrix or slurry.
Claims19
A sizing composition comprising:
- water;
- a polyvinylpyrrolidone film former having a weight average molecular weight of 1,000,000 Da to 1,700,000 Da;
- a silane coupling agent;
- a lubricant comprising a condensation reaction product of a saturated fatty acid having at least 16 carbon atoms and a polyamine;
- and
- a surfactant;
- wherein the polyvinylpyrrolidone film former comprises from 30 wt. % to 50 wt. % of the dry solids of the sizing composition, and
- wherein a weight ratio based on dry solids of the polyvinylpyrrolidone film former to the lubricant is from 0.8:1 to 1.7:1.
Glass fibers for use in reinforcing gypsum board, the glass fibers comprising:
- a plurality of chopped glass fibers coated with a sizing composition, wherein the sizing composition comprises:
- water;
- a polyvinylpyrrolidone film former having a weight average molecular weight of 1,000,000 Da to 1,700,000 Da;
- a silane coupling agent;
- a lubricant comprising a condensation reaction product of a saturated fatty acid having at least 16 carbon atoms and a polyamine;
- and
- a surfactant;
- wherein the polyvinylpyrrolidone film former comprises from 30 wt. % to 50 wt. % of the dry solids of the sizing composition;
- wherein a weight ratio based on dry solids of the polyvinylpyrrolidone film former to the lubricant is from 0.8:1 to 1.7:1;
- and
- wherein the sizing composition is present on the chopped glass fibers in an amount of from 0.05% to 0.3% by weight based on the total weight of the sized chopped glass fibers.
A gypsum board comprising:
- a gypsum layer having a first major surface and a second major surface, the gypsum layer comprising gypsum and a plurality of chopped glass fibers coated with a sizing composition distributed in the gypsum, wherein the sizing composition comprises:
- water;
- a polyvinylpyrrolidone film former having a weight average molecular weight of 1,000,000 Da to 1,700,000 Da;
- a silane coupling agent;
- a lubricant comprising a condensation reaction product of a saturated fatty acid having at least 16 carbon atoms and a polyamine;
- and
- a surfactant;
- wherein the polyvinylpyrrolidone film former comprises from 30 wt. % to 50 wt. % of the dry solids of the sizing composition;
- wherein a weight ratio based on dry solids of the polyvinylpyrrolidone film former to the lubricant is from 0.8:1 to 1.7:1;
- a first facing layer applied to the first major surface of the gypsum layer;
- and
- a second facing layer applied to the second major surface of the gypsum layer.
Dependencies are inferred from the claim text.