Polyolefin coated fabric reinforcement and cementitious boards reinforced with same
AssigneeSaint-Gobain Adfors Canada, Ltd.
InventorsCharles G. Herbert, Pranjal Shah
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Abstract
The present invention provides a method making glass fiber fabric reinforcements, cement boards, and glass fiber coatings for such reinforcements. The glass fiber fabric reinforcement includes a glass fabric containing multiple yarns containing glass filaments and a polymeric coating disposed onto the multiple yarns to form a coated glass fabric. The polymeric coating comprises a polyolefin based copolymer composition whereby the glass fabric has a Gurley Stiffness measurement of about 100-3000 mg and an ASTM D 638 (2% Secant) modulus of compression of about 1-100 MPa. The reinforcement is sufficiently drapable and lacking in shape memory so as to be curved around the edge of a cement board during the manufacture of same.
Claims10
A method of making a fabric reinforcement comprising:
- a) providing a plurality of glass yarns;
- b) extruding a substantially uniform thickness of a softened polyolefin based polymeric composition over said glass yarns to form coated glass yarns, the softened polyolefin based polymeric composition comprising:
- i) about 70-80 wt % heterophasic polypropylene copolymer;
- ii) about 10-30 wt % polypropylene homopolymer;
- iii) about 0-5 wt % ethylene-olefin copolymer;
- iv) about 2-4 wt % maleic anhydride-g-polypropylene;
- v) about 0-20 wt % inorganic filler;
- and
- vi) about 500-1500 ppm vinylidene fluoride-hexafluoroalkene copolymer;
- and
- c) forming a laid scrim with said coated yarns.
Dependencies are inferred from the claim text.