The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 1979
Filed:
Jan. 23, 1978
Marvin H Lehr, Bath, OH (US);
The B. F. Goodrich Company, Akron, OH (US);
Abstract
Polyvinyl chloride (PVC) resin is compounded with a conventional impact modifier referred to herein as a 'co-modifier', and a block copolymer 'ultra-modifier' which together provide a composition of unexpectedly enhanced impact strength. Irrespective of the characteristic particle size distribution of the co-modifier, which may be normal, bimodal or neither, the combination of ultra-modifier and co-modifier produces a broad distribution of small and large modifier particles. Better impact strength than with either small particles alone, or large particles alone is thus obtained. The ultra-modifier, which synergistically increases the impact strength of conventionally impact-modified vinyl chloride polymer compositions, consists essentially of a block copolymer of a vinyl aromatic compound and a conjugated diene, such as a styrene-diene (SD) diblock copolymer, or styrene-diene-styrene (SDS) block copolymer; the ultra-modifier is a polyblock copolymer, including linear diblock, triblock, tetrablock copolymers, and radial block copolymers including triblock and tetrablock copolymers. The co-modifier may be any elastomer additive, preferably a nucleated rubbery graft copolymer.