US Patent No. 10,920,009

THERMOSETTING RESIN COMPOSITION, SHEET-MOLDING COMPOUND AND PRODUCTION METHOD THEREFOR, AND FIBER-REINFORCED COMPOSITE MATERIAL


Patent No. 10,920,009
Issue Date February 16, 2021
Title Thermosetting Resin Composition, Sheet-molding Compound And Production Method Therefor, And Fiber-reinforced Composite Material
Inventorship Hayato Ogasawara, Chiyoda-ku (JP)
Yuji Kazehaya, Chiyoda-ku (JP)
Assignee MITSUBISHI CHEMICAL CORPORATION, Chiyoda-ku (JP)

Claim of US Patent No. 10,920,009

1. A sheet-molding compound, comprising:a thickened product of a thermosetting resin composition; and
a component (C): a reinforced fiber bundle having a fiber length of 5 to 120 mm,
wherein the thermosetting resin composition includes
a component (A): a novolac vinyl ester resin having a hydroxyl group and an ethylenically unsaturated group in the molecule,
a component (B): an ethylenically unsaturated monomer, and
a component (D): polyisocyanate,
wherein the component (A) has a hydroxyl value of 150 mgKOH/g or less and a ratio X/Y of less than 1, where X is an amount in mole number of the hydroxyl group per 1 g of the component (A), and Y is an amount in mole number of the ethylenically unsaturated group per 1 g of the component (A), and
the component (A) comprises
a modified novolac vinyl ester resin obtained by reacting a component (E): monoisocyanate with a component (A?): an unmodified novolac vinyl ester resin having a hydroxyl group and an ethylenically unsaturated group in the molecule and having a hydroxyl value of more than 150 mgKOH/g.