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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.:

US 9238720 B1

PDFFull Text
Date of Patent:
Jan. 19, 2016

Filed:

Feb. 16, 2010

Prepreg and laminate

Applicants:

Masayoshi Ueno, Tokyo, JP;

Yoshihiro Kato, Tokyo, JP;

Takeshi Nobukuni, Tokyo, JP;

Inventors:

Masayoshi Ueno, Tokyo, JP;

Yoshihiro Kato, Tokyo, JP;

Takeshi Nobukuni, Tokyo, JP;

Assignee:

MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo, JP;

Attorney:

Greenblum & Bernstein, P.L.C.

Primary Examiner:

Jennifer Chriss

Assistant Examiner:

Camie Thompson

Int. Cl.
CPC ...
B32B 5/24 (2006.01); C08J 5/24 (2006.01); B32B 15/08 (2006.01); B32B 15/20 (2006.01); B32B 17/04 (2006.01); B32B 27/04 (2006.01); B32B 27/38 (2006.01); D03D 13/00 (2006.01); D03D 15/00 (2006.01); H05K 1/03 (2006.01);
U.S. Cl.
CPC ...
C08J 5/24 (2013.01); B32B 15/08 (2013.01); B32B 15/20 (2013.01); B32B 17/04 (2013.01); B32B 27/04 (2013.01); B32B 27/38 (2013.01); D03D 13/008 (2013.01); D03D 15/0011 (2013.01); H05K 1/0366 (2013.01); C08J 2363/00 (2013.01); D10B 2505/02 (2013.01); H05K 2201/029 (2013.01); Y10T 442/20 (2015.04);
Abstract

This invention relates to a prepreg having a low thermal expansion coefficient in plane direction and a high rigidity, and more particularly to a prepreg comprising a glass cloth (A), and a resin composition including a cyanate ester resin (B), a non-halogen based epoxy resin (C) and an inorganic filler (D), wherein the glass cloth (A) is characterized that when the weight per 1 mis W (g/m), the thickness is t (μm), the number of warp threads per inch is X (thread/inch), and the number of weft threads per inch is Y (thread/inch), the total of X and Y is 150 to 240, t is 17 to 35, and the value of W/t as the apparent density is 1.1 to 1.5, and that the volume fraction of the glass cloth (A) in the prepreg is 32% to 42%.

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