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US 4,772,328 AGranted
Hydraulic cementitious compositions reinforced with fibers containing polyacrylonitrile
AssigneeBASF SE
InventorCharles R. Pfeifer
Life of this patent
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Abstract
A reinforced hydraulic cementitious composition containing a fibrous material comprising a homopolymer of acrylonitrile or a copolymer of acrylonitrile having a molar concentration of acrylonitrile monomer units in the range of from about 98 percent to about 100 percent which has a denier in the range of from about 1 to about 25 and a length of from about 0.15 inch to 1 inch.
Claims7
A solid, reinforced cementitious composition comprising:
- (a) a hydraulic cement;
- and,
- (b) a polymerized acrylonitrile fiber material present in an amount in the range of from about 0.05 to about 0.5 percent by weight of cementitious composition and comprising a molar concentration of from about 98 percent to about 100 percent acrylonitrile monomer units and being characterized by:
- (i) having a length in the range of from about 0.375 to about 0.75 inch;
- (ii) having a denier in the range of from 1.5 to about 21;
- and
- (iii) having a modulus in the range of from about 30 g/denier to about 70 g/denier, a strength in the range of from about 3.0 g/denier to about 5.0 g/denier, and an extensibility in the range of from about 25 to about 35 percent.
4 more elements
Dependencies are inferred from the claim text.