Carpet tack strip with urethane base
First Claim
1. A carpet tack strip for securing carpet in place on a floor of interest including a synthetic resinous strip means adapted to carry tack and pre-nail elements with the tack elements being adapted to retain the edge portions of a carpet in place thereon, said tack strip further comprising:
- a synthetic resinous formulation consisting essentially of an at least partially filled, cross-linked relatively low density polyurethane material comprisingthe reaction product of a polyol prepolymer and an isocyanate cross-linking agent, wherein said polyol is selected from the group consisting of polyoxypropylene-diols having a molecular weight up to approximately 2000 and polyoxypropylene-triols having a molecular weight up to approximately 4000, wherein said polyisocyanate consists essentially of methylene di-isocyanate;
an amount of a catalyst;
an amount of reinforcinga filler consisting essentially of inert particles with an average particle diameter of between about 0.5 microns and 35.0 microns;
a porosity inducing agent selected from chemical blowing agents and mechanical frothing agents activated at temperatures in excess of about 260°
F. to produce a cellular structure;
a plurality of spaced carpet securing tack elements received in and protruding from the top of said strip; and
means for fastening the strip to said floor of interest.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to an improved synthetic resinous formulation utilized to form a substrate for retention of carpet while securing tack and pre-nail elements in strip form, and with the pre-nails being adapted to secure the substrate in place along the edge surfaces of the floor and with the tack elements being adapted to retain the edge portions of a carpet in place thereon. The substrate is characterized in that it is formed essentially of a filled polyurethane compound which possesses unusual mechanical properties particularly desirable in the formation of carpet retaining strips. These properties include the flexibility to permit the strip to conform to an irregular floor surface, and furthermore can be readily cut and notched to allow it to be bent to conform to an inside or outside corner. Because of the excellent plastic memory, the carpet retaining tacks are held at a desired angle even when subjected to substantial lateral tension caused by the stretched in-place carpet. The formulation of the polyurethane includes a prepolymer comprising a polyether polyol (35%-40%), a cross-linking agent (15%-20%), a filler consisting essentially of inert ingredients (10%-36%), a catalyst (10%-15) and a chemical blowing or frothing agent (mechanical) (3%-5%), and wherein methylene di-isocyanate is added to the prepolymer components blend (component B), the prepolymer consisting of 80% of the blend, balance methylene di-isocyanate (component A) (20%).
29 Citations
8 Claims
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1. A carpet tack strip for securing carpet in place on a floor of interest including a synthetic resinous strip means adapted to carry tack and pre-nail elements with the tack elements being adapted to retain the edge portions of a carpet in place thereon, said tack strip further comprising:
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a synthetic resinous formulation consisting essentially of an at least partially filled, cross-linked relatively low density polyurethane material comprising the reaction product of a polyol prepolymer and an isocyanate cross-linking agent, wherein said polyol is selected from the group consisting of polyoxypropylene-diols having a molecular weight up to approximately 2000 and polyoxypropylene-triols having a molecular weight up to approximately 4000, wherein said polyisocyanate consists essentially of methylene di-isocyanate; an amount of a catalyst; an amount of reinforcing a filler consisting essentially of inert particles with an average particle diameter of between about 0.5 microns and 35.0 microns; a porosity inducing agent selected from chemical blowing agents and mechanical frothing agents activated at temperatures in excess of about 260°
F. to produce a cellular structure;a plurality of spaced carpet securing tack elements received in and protruding from the top of said strip; and means for fastening the strip to said floor of interest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification