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US 4,418,123 AGranted
Extrudable self-adhering elastic and method of employing same
AssigneeH. B. Fuller Company
InventorsWilliam L. Bunnelle, Richard C. Lindmark
Life of this patent
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Abstract
A self-adhering elastic comprises a block copolymer having glassy endblocks and an amorphous midblock, a midblock resin and an endblock resin.
Claims21
A method for imparting elastic properties to a flexible substrate, which comprises contacting a surface of the flexible substrate with a band of a self-adhering elastic composition which consists essentially of:
- (a) a block copolymer comprising at least one substantially amorphous, rubbery polymeric midblock and at least was glassy poly(vinylarene) end blocks;
- (b) about 20 to 150 parts by weight of a midblock associating resin;
- and
- (c) about 10 to 50 parts by weight of an endlock associating resin having a glass transition temperature and a softening point above about 115.degree. C. each per 100 parts of the block copolymer;
- wherein the proportions of components (a), (b), and (c) are selected to provide the following properties:
- (i) a tensile strength at 500% elongation, determined at 20.degree.-25.degree. C., of at least 50 pounds per square inch;
- (ii) a 180.degree. peel resistance, according to PSTC-1, determined at 20.degree.-25.degree. C. 24 hours after formation of the pressure-sensitive adhesive bond, of at least about 450 grams per 25.4 mm-width;
- (iii) a dead load deformation, tested at 37.8.degree. C. and 1500 g/cm.sup.2, less than 50%;
- and
- (iv) a loss modulus of 5.times.10.sup.4 to 100.times.10.sup.4 dynes/cm.sup.2, a storage modulus of 65.times.10.sup.4 to 225.times.10.sup.4 dynes/cm.sup.2, and a loss tangent of 0.03 to 1.0, at 0.01-0.25 Hz at 25.degree.-50.degree. C.
7 more elements
The method for imparting a self-adhering elastic to a flexible substrate comprising the steps of:
- (a) unreeling a band of self-adhering elastic composition from a roll, said roll being maintained at a temperature below the softening point of said self-adhering elastic and said band of self-adhering elastic being an extrudate at least 50 microns in thickness which consists essentially of a block copolymer comprising at least one substantially amorphous, rubbery polymeric midblock and at least two glassy poly(vinylarene) end blocks;
- (ii) 20-150 parts per hundred of a midblock associating resin;
- and (iii) 10-150 parts per hundred of an aromatic, essentially hydrocarbon endblock associating resin having a Tg and a softening point above 115.degree. C. each per one hundred parts of the block copolymer;
- wherein the proportions (i), (ii), and (iii) are selected to provide the following properties:
- (i) a tensile strength at 500% elongation, determined at 20.degree.-25.degree. C., of at least 50 pounds per square inch;
- (ii) at 180.degree. peel resistance, according to PSTC-1, determined at 20.degree.-25.degree. C. 24 hours after formation of the pressure-sensitive adhesive bond, of at least about 450 grams per 25.4 mm-width;
- (iii) a dead load deformation, tested at 37.8.degree. C. and 1500 g/cm.sup.2, less than 50%;
- and
- (iv) a loss modulus of 5.times.10.sup.4 to 100.times.10.sup.4 dynes/cm.sup.2, a storage modulus of 65.times.10.sup.4 to 225.times.10.sup.4 dynes/cm.sup.2, and a loss tangent of 0.03 to 1.0, at 0.01-0.25 Hz at 25.degree.-50.degree. C.
- (b) contacting the band of self-adhering elastic with a surface of a flexible substrate forming a bond between the substrate and elastic.
7 more elements
Dependencies are inferred from the claim text.