Microwave-transparent thermosetting resin compositions, electrical laminates obtained therefrom, and process of producing these
AssigneeGIL Technologies, a division of the Alpha Corporation
InventorsScott A. Lane, Donald C. Rollen, Timothy W. Austill
Life of this patent
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Abstract
The present invention relates to a thermosetting resin composition with excellent electrical properties comprising (a) one or more terminally unsaturated urethane resins, (b) styrene, and (c) brominated styrene. The aforementioned composition finds great utility as a printed circuit board laminate suitable for use at microwave frequencies.
Claims47
A thermosetting resin composition, comprising:
- (a) One or more terminally unsaturated urethanes selected from the group of:
- 1) one characterized by the formula:
- 8
- where R1 is H or CH3, R2 is an organic residue from a monohydric alcohol and R3 is an organic residue from a diisocyanate;
- 2) and one characterized by the formula:
- 9
- where R1 is H or CH3, R2 is an organic residue from a monohydric alcohol and R3 is an organic residue from a diisocyanate, and R4 is an isocyanurate compound of the following structure:
- 10
- and
- (b) Styrene monomer;
- and
- (c) Bromostyrene, characterized by the formula:
- 11
- wherein, the ratio of the sum of components (a) to the sum of components (b) and (c) is less than 0.2, and the ratio of (b) to (c) is less than 1.5.
A method of producing an electrical laminate comprising the steps of:
- (1) impregnating at least one substrate with a thermosetting resin composition comprising catalysts which induce free radical cure, polymerization, or UV initiation, in about 0.1% to about 2% by weight of the total composition;
- and
- (2) curing the resin impregnated substrate to produce an electrical laminate.
An electrical laminate obtained by
- (1) impregnating at least one substrate with a thermosetting resin composition comprising:
- (a) One or more terminally unsaturated urethanes selected from the group of:
- 1) one characterized by the formula:
- 12
- where R1 is H or CH3, R2 is an organic residue from a monohydric alcohol and R3 is an organic residue from a diisocyanate;
- 2) and one characterized by the formula:
- 13
- where R1 is H or CH3, R2 is an organic residue from a monohydric alcohol and R3 is an organic residue from a diisocyanate, and R4 is an isocyanurate compound of the following structure:
- 14
- and
- (b) Styrene monomer;
- and
- (c) Bromostyrene, characterized by the formula:
- 15
- wherein, the ratio of the sum of components (a) to the sum of components (b) and (c) is less than 0.2, and the ratio of (b) to (c) is less than 1.5;
- and (d) catalysts which induce free radical cure, polymerization, or UV initiation, in about 0.1% to about 2% by weight of the total composition;
- and
- (2) curing the resin impregnated substrate to produce an electrical laminate.
42 The laminate of claim 41 having an electrical conductive layer clad on at least one side of the laminated cured substrates.
The laminate of claim 42 wherein the electrical conductive layer is a metal selected from the group of aluminum, silver, gold, brass and copper.
An electrical laminate, comprising at least one reinforcement substrate and a crossed linked, thin wall thermosetting resin composition comprising:
- (a) One or more terminally unsaturated urethanes selected from the group of:
- 1) one characterized by the formula:
- 16
- where R1 is H or CH3, R2 is an organic residue from a monohydric alcohol and R3 is an organic residue from a diisocyanate;
- 2) and one characterized by the formula:
- 17
- where R1 is H or CH3, R2 is an organic residue from a monohydric alcohol and R3 is an organic residue from a diisocyanate, and R4 is an isocyanurate compound of the following structure:
- 18
- and
- (b) Styrene monomer;
- and
- (c) Bromostyrene, characterized by the formula:
- 19
- wherein, the ratio of the sum of components (a) to the sum of components (b) and (c) is less than 0.2, and the ratio of (b) to (c) is less than 1.5;
- and (d) catalysts which induce free radical cure, polymerization, or UV initiation, in about 0.1% to about 2% by weight of the total composition.
Dependencies are inferred from the claim text.