Prepreg and laminate

Patent metadata

Field	Value
Publication number	US-9238720-B2
Application number	US-201013202829-A
Country	US
Kind code	B2
Filing date	Feb 16, 2010
Priority date	Feb 25, 2009
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

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 m 2 is W (g/m 2 ), 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%.

First claim

The invention claimed is:

1. A prepreg composed of (A) a glass cloth with a resin composition comprising (B) a cyanate resin, (C) a non-halogen based epoxy resin and (D) an inorganic filler, wherein the weight per 1 m 2 in said glass cloth (A) is W (g/m 2 ), thickness is t (μm), end count of warp threads per inch is X (thread/inch), and end count 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 an apparent density is 1.1 to 1.5, and that volume content of the glass cloth (A) in the prepreg is 32% to 42%.

2. A prepreg according to claim 1 , wherein the cyanate resin (B) is a cyanate resin represented by the following general formula (1),

wherein each R independently represents a hydrogen atom or a methyl group, and n represents an integer of not less than 1.

3. A laminate obtained by curing a prepreg as claimed in claim 1 .

4. A metal foil-clad laminate obtained by curing a laminate of a prepreg as claimed in claim 1 and a metal foil.

5. A laminate obtained by curing a prepreg as claimed in claim 2 .

6. A metal foil-clad laminate obtained by curing a laminate of a prepreg as claimed in claim 2 and a metal foil.

Assignees

• Ueno Masayoshi
• Kato Yoshihiro
• Nobukuni Takeshi
• Mitsubishi Gas Chemical Co

Inventors

• Ueno Masayoshi
• Kato Yoshihiro
• Nobukuni Takeshi

Classifications

• B32B17/04 Primary

  bonded with or embedded in a plastic substance · CPC title

• H05K2201/029

  Woven fibrous reinforcement or textile · CPC title

• C08J5/24 Primary

  Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs · CPC title

• B32B15/20

  comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)} · CPC title

• D03D13/008

  characterised by weave density or surface weight · CPC title