Bitumen backed carpet tile
AssigneeMilliken & Company
InventorsKenneth Benjamin Higgins, Thomas Earney Austin
Life of this patent
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Abstract
A bitumen composition suitable for a carpet tile backing is provided having from 12 to 35 wt. % bitumen, from 50 to 85 wt. % of an inorganic filler such as calcium carbonate and from 0.5 to 20 wt. % of an acid functionalized polyolefin selected from acrylic acid, maleic acid and maleic anhydride grafted isotactic polypropylene. The cold flow characteristics of the composition can be improved by incorporating from 1 to 10 wt. % atactic polypropylene.
Claims30
A bitumen composition comprising:
- 12 to 35 weight % of bitumen having a ring and ball softening point ranging from 100.degree. F. to 200.degree. F. and a needle point penetration of from 20 to 200;
- 0.5 to 20 weight % of an acid functionalized polyolefin polymer, said polymer comprising at least 80 weight % olefin monomers selected from ethylene, propylene and butylene, and from 0.2 to 20 weight % acid monomers selected from organic, unsaturated carboxylic acids and carboxylic acid anhydrides, wherein said polymer has a plurality of pendant acid or acid anhydride groups;
- and
- 50 to 85 weight % of a finely divided, inorganic filler capable of bonding to said pendant acid or acid anhydride groups, wherein said filler is characterized by an average particle size greater than 5 microns.
A backing composition for a carpet tile, comprising:
- 15 to 25 weight % of an unblown bitumen having a ring and ball softening point ranging from 130.degree. F. to 170.degree. F. and a needle point penetration of from 100 to 175;
- 0.5 to 20 weight % of an acid functionalized polyolefin polymer, said polymer having a polyolefin backbone selected from polymers, copolymers and terpolymers of ethylene, propylene and butylene, and a plurality of pendant organic acid or acid anhydride groups formed by grafting acid monomers selected from acrylic acid, maleic acid and maleic anhydride to said polyolefin backbone;
- and
- 60 to 85 weight % of an inorganic filler selected from calcium carbonate, magnesium carbonate, magnesium sulfate, aluminum hydrate, barium sulfate and glass particles having an average particle size ranging from 5 to 192 microns and glass fibers having an average length of from 1/1000 inch to 1/16 inch.
In a unitary carpet tile having a fibrous wear surface and a layer of a bituminous backing composition, wherein the backing composition comprises:
- 15 to 25 weight % of an unblown bitumen having a ring and ball softening point ranging from 130.degree. F. to 170.degree. F. and a needle point penetration of from 100 to 175;
- 1.0 to 8 weight % of an acid functionalized polyolefin polymer, said polymer having a polyolefin backbone selected from polymers, copolymers and terpolymers of ethylene, propylene and butylene, and a plurality of pendant acid or acid anhydride groups formed by grafting from 0.2 to 10 weight %, based on a total weight of said polymer, of an unsaturated, carboxylic acid or carboxylic acid anhydride monomer to said polyolefin backbone;
- and
- 60 to 80 weight % of an inorganic filler selected from calcium carbonate, magnesium carbonate, magnesium sulfate, aluminum hydrate, barium sulfate and glass particles having an average particle size ranging from 5 to 192 microns and glass fibers having an average length of from 1/1000 inch to 1/16 inch.
Dependencies are inferred from the claim text.