Sulfur containing lignin modified alkaline earth treated phenolic impregnating resins for core layers of humidity resistant laminates
AssigneeWestinghouse Electric Corp.
InventorsMartin P. Seidel, Timothy J. Fuller
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Abstract
A resin containing laminate is made, where the resin comprises the cured admixture of phenolic resin, sulfur containing lignin, and a catalytic reactant containing 50 wt. % to 100 wt. % of an alkaline-earth compound and 0 wt. % to 50 wt. % of an alkali-metal compound.
Claims10
A moisture resistant, high pressure consolidated laminate, containing at least a core layer of a plurality of resin impregnated core sheets, the core impregnating resin comprising the cured admixture of:
- (A) phenol,
- (B) aldehyde,
- (C) sulfur containing lignin, and
- (D) an effective amount of catalytic reactant consisting essentially of:
- (i) 50 wt. % to 100 wt. % of an alkaline-earth metal compound selected from the group consisting of calcium oxide, calcium hydroxide, barium oxide, barium hydroxide, hydrates thereof, and mixtures thereof, and
- (ii) 0 wt. % to 50 wt. % of an alkali-metal compound, said core impregnating resin bonding the core sheets together.
A moisture resistant, high pressure consolidated laminate, containing at least a core layer of a plurality of resin impregnated core sheets, the core impregnating resin consisting essentially of the cured admixture of:
- (A) phenol,
- (B) formaldehyde,
- (C) sulfur containing lignin, and
- (D) catalytic reactant consisting essentially of:
- (i) 50 wt. % to 100 wt. % of an alkaline-earth metal compound selected from the group consisting of calcium oxide, calcium hydroxide, barium oxide, barium hydroxide, hydrates thereof, and mixtures thereof, and
- (ii) 0 wt. % to 50 wt. % of an alkali-metal compound, where the mole ratio of (phenol):(formaldehyde) is from about (1):(1) to about (1):(1.6), the weight ratio of (phenol):(sulfur containing lignin) is from about (1):(0.05) to about (1):(0.4), the catalytic reactant is added in an amount effective to provide a pH of the resin admixture of between about 7.5 and about 9.0, and the resin is cured under pressure at a temperature of over about 130.degree. C., said core impregnating resin bonding the core sheets together.
Dependencies are inferred from the claim text.