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US 5,180,795 AGranted
Retarders for hardening phenolic resins
AssigneeBorden, Inc.
InventorArthur H. Gerber
Life of this patent
Estimating the term…
Abstract
There is disclosed methods and compositions for retarding the room temperature hardening of phenolic resole resins when such resins are mixed with lightburned magnesium oxide with or without an ester functional hardening agent. Compounds which act as retarders include azelaic acid, salicylamide, sulfanilic acid, N-methylaniline, and 2,6-diethylaniline.
Claims17
A binder composition comprising a mixture of:
- a. a phenolic resole resin having a pH of about 4.5 to 9, a resin solids content of about 50% to 90% by weight of said resin, and a viscosity of about 100 to 4,000 cps at 25.degree. C.;
- b. a magnesium hardening agent selected from the group consisting of magnesium hydroxide and lightburned magnesium oxide the amount of magnesium hardening agent being sufficient to accelerate the hardening of said resin, said lightburned magnesium oxide having a surface area of about 10 to 200 square meters per gram;
- c. a retarder selected from the group consisting of:
- aniline;
- a substituted aniline having up to one N-alkyl group and up to 2 alkyl groups on the aromatic ring wherein each alkyl group has from 1 to 3 carbon atoms;
- salicylamide;
- sulfanilic acid;
- m-aniline sulfonic acid;
- and o-aniline sulfonic acid, said retarder being in a quantity sufficient to retard the hardening of the mixture;
- and
- d. from about 5% to 40% by weight of the resin of an ester functional hardening agent selected from the group consisting of a lactone, a carboxylic acid ester, a cyclic organic carbonate, and mixtures thereof.
8 more elements
A binder composition comprising a mixture of:
- a. a phenol formaldehyde resole resin having a pH of about 4.5 to 9, a resin solids content of about 50% to 90% by weight of said resin, and a viscosity of about 100 to 4,000 cps at 25.degree. C.;
- b. about 2% to 30% of lightburned magnesium oxide, based on the weight of resin, said oxide having a surface area of about 10 to 200 square meters per gram;
- c. a retarder selected from the group consisting of:
- aniline;
- a substituted aniline having up to one N-alkyl group and up to 2 alkyl groups on the aromatic ring wherein each alkyl group has from 1 to 3 carbon atoms;
- salicylamide;
- sulfanilic acid;
- m-aniline sulfonic acid;
- and o-aniline sulfonic acid, said retarder being in a quantity sufficient to retard the hardening of the mixture;
- d. from about 5% to 40%, by weight of the resin, of an ester functional hardening agent selected from the group consisting of a lactone, a carboxylic acid ester, a cyclic organic carbonate, and mixtures thereof.
7 more elements
Dependencies are inferred from the claim text.