IP Library › Granted Patent US 7,335,275
Granted Patent B2
US 7,335,275 · App. 10/940,563 · Granted Feb 26, 2008

Method of making an inorganic sheet laminate

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Quick Facts
Patent No.
US 7,335,275
App. No.
10/940,563
Granted
Feb 26, 2008
Kind
B2
Abstract

A laminate of inorganic sheet and polyester resin having an overall thickness of 5 to 25 mils and having an elongation at break in both the cross direction and machine direction of at least 25%.

Claims (7)

1. A method of making a laminate useful in electrical insulation, comprising:

a) providing two inorganic sheets to the nip between a pair of rolls,

b) extruding a molten polyester polymer between and onto the inorganic sheets prior to or into the nip between the pair of rolls,

c) consolidating the inorganic sheets and molten polymer between the rolls to form an unquenched laminate, and

d) cooling the unquenched laminate to form a quenched laminate resulting in a laminate sheet having an overall thickness of 5 to 25 mils and having an elongation at break in both cross direction and machine direction of at least 25%.

2. The method of claim 1 wherein the molten polyester polymer is extruded through a slot die.

3. The method of claim 1 wherein the molten polyester polymer includes a layered combination of polyester polymers.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 25, 2019
From: E. I. DU PONT DE NEMOURS AND COMPANY
To: DUPONT SAFETY & CONSTRUCTION, INC.
Reel/Frame 051180/0648 →