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:
Nov. 14, 2017
Filed:
Oct. 11, 2013
Maruo Calcium Co., Ltd., Akashi-shi, JP;
Hidemitsu Kasahara, Hyogo, JP;
Shigeo Takiyama, Hyogo, JP;
MARUO CALCIUM CO., LTD., Akashi-shi, JP;
Abstract
The calcium carbonate filler for a resin is provided in which a volatile component such as water present in a surface of calcium carbonate is likely to be degassed even when the filler is incorporated into and kneaded with a resin having high processing temperature at a high concentration, and foaming or the like can be suppressed. In particular, the calcium carbonate filler is useful in optical fields that require reflectivity and light resistance. The calcium carbonate filler for a resin has a content rate of particles having a particle diameter of 0.26 μm or less is 30% or less in a number particle size distribution diameter measured from an electron micrograph, and satisfies the following expressions (a) Dms5/Dmv5≦3.0, (b) 1.0≦Sw≦10.0 (m/g) and (c) Dma≦5.0 (% by volume):