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:
May. 21, 2002
Filed:
Jul. 26, 2000
Eitaro Nakamura, Tokyo, JP;
Tadashi Takizawa, Takaoka, JP;
Manabu Makino, Takaoka, JP;
Tomoyuki Kose, Takaoka, JP;
Yoshimitu Nagatomo, Niihama, JP;
Shin Dai-ichi Vinyl Corporation, Tokyo, JP;
Abstract
Granules of a polyvinyl chloride resin for preparation of paste which comprise 10% by weight or less of components having diameters of 10 &mgr;m or smaller and less than 0.5% by weight of over size components after classification using a 149 &mgr;m standard sieve, have a bulk density of 0.45 to 0.58 g/cm and give a plastisol comprising less than 0.3% by weight of over size components after classification using a 62 &mgr;m standard sieve, wherein the plastisol is obtained by mixing 100 g of the granules of a polyvinyl chloride resin and 50 g of dioctyl phthalate; and a process for producing granules of a polyvinyl chloride resin for preparation of paste which comprises spray-drying an aqueous dispersion of a vinyl chloride polymer obtained by emulsion polymerization or micro suspension polymerization of vinyl chloride or a mixture containing vinyl chloride and a monomer copolymerizable with vinyl chloride, classifying granular particles obtained by the spray-drying using ultrasonic vibration sieves which are equipped with a screen having an opening of 149 &mgr;m or smaller and removing the over size components.