Abstract Individual glass fibers are coated with a composition which includes the Mannich reaction product of substitutable dihydric or trihydric phenol, formaldehyde and a primary or secondary amine. The preferred coating composition comprises an aqueous mixture including the aforementioned Mannich reaction product or an acid adduct thereof and an elastomeric latex selected from the natural and synthetic rubber latices such as neoprene rubber, isoprene rubber, butyl rubber, butadiene-styrene copolymer rubber, acrylonitrile-butadiene-styrene terpolymer rubber, styrene-butadiene-vinylpyridine terpolymer rubbers and the like. An aqueous solution of the coating composition is prepared and applied to glass fibers as a sizing composition and/or as a coating composition after the glass fibers are sized. Subsequent to coating of the glass fiber strands with the aforementioned coating composition, the strands are dried by heating in a microwave oven, a forced air oven or the like.
A METHOD OF PREPARING GLASS FIBER STRANDS FOR REINFORCING ELASTOMERIC COMPOSITIONS COMPRISING DRAWING GLASS FIBERS FROM MOLTEN CONES OF GLASS, APPLYING TO THE FIBERS AS THEY ARE BEING WITHDRAWN AN AQUEOUS COATING AND SIZING COMPOSITION COMPRISING A SUBSTANTIAL QUANTITY OF WATER, AN ELASTOMERIC LATEX SELECTED FROM THE GROUP CONSISTING OF NATURAL AND SYNTHETIC RUBBER LATICES AND A RUBBER ADHESIVE SELECTED FROM THE GROUP CONSISTING OF THE MANNICH REACTION CONDENSATION PRODUCT OF A DIHYDRIC OR TRIHYDRIC PHENOL HAVING AT LEAST TWO SUBSTITUTABLE POSITIONS, FORMALDEHYDE AND A PRIMARY OR SECONDARY MONOAMINE, GATHERING THE FIBERS TOGETHER INTO STRANDS AND DRYING THE STRANDS TO THEREBY PROVIDING GLASS FIBER STRANDS HAVING A WEIGHT GAIN OF BETWEEN 15 AND 40 PERCENT BY WEIGHT BASED UPON THE WEIGHT OF THE DRY GLASS OF SAID SIZING AND COATING COMPOSITION.
Claim 2
Independent Claim
131 words
A METHOD OF PREPARING GLASS FIBER STRANDS FOR REINFORCING ELASTOMERIC COMPOSITIONS COMPRISING DRAWING GLASS FIBERS FROM MOLTEN CONES OF GLASS, APPLYING TO THE FIBERS AS THEY ARE BEING WITHDRAWN AN AQUEOUS COATING AND SIZING COMPOSITION COMPRISING A SUBSTANTIAL QUANTITY OF WATER, AN ELASTOMERIC LATEX SELECTED FROM THE GROUP CONSISTING OF NATURAL AND SYNTHETIC RUBBER LATICES AND A RUBBER ADHESIVE SELECTED FROM THE GROUP CONSISTING OF THE MANNICH REACTION CONDENSATION PRODUCT OF A DIHYDRIC OR TRIHYDRIC PHENOL HAVING AT LEAST TWO SUBSTITUTABLE POSITIONS, FORMALDEHYDE AND A PRIMARY OR SECONDARY MONOAMINE, GATHERING THE FIBERS TOGETHER INTO STRANDS AND DRYING THE STRANDS TO THEREBY PROVIDING GLASS FIBER STRANDS HAVING A WEIGHT GAIN OF BETWEEN 15 AND 40 PERCENT BY WEIGHT BASED UPON THE WEIGHT OF THE DRY GLASS OF SAID SIZING AND COATING COMPOSITION.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein there if a silane coupling agent employed in the coating composition.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein said coupling agent is gamma amino propyltriethoxysilane.