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US 5,852,071 AGranted
Biphenyl additive for improvement in urethane foundry binders
AssigneeBorden Chemical, Inc.
InventorMichael M. Geoffrey
Life of this patent
Estimating the term…
Abstract
Compositions and methods for improving the characteristics of foundry cores which includes adding to the foundry aggregate mixture one or more biphenyl compounds.
Claims38
A composition comprising:
- i) a polyhydroxy resin solution;
- ii) a polyisocyanate solution, said solutions i) and ii) present in amounts to produce a cured binder in the presence of a suitable catalyst;
- iii) at least one biphenyl additive of the formula below ##STR3## where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6, which may be the same or different, are selected from the group consisting of H and C.sub.1 -C.sub.6 branched and unbranched alkyl and alkenyl substituents, with the proviso, that when R.sub.1 -R.sub.6 are each hydrogen and the amount of such a compound is present in amounts of less than 1% by weight of a solution of i) or ii) a second additive of the formula as defined above is present except that R.sub.1 -R.sub.6 are not each hydrogen;
- and
- iv) foundry aggregate.
2 more elements
A method for improving the hot strength of cured foundry cores comprising mixing together:
- i) foundry aggregate
- ii) at least two foundry binder components comprising a polyhydroxy component and a polyisocyanate component and
- iii) one or more biphenyls, of the following structure:
- ##STR5## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 which may be the same or different, are selected from the group consisting of H and C.sub.1 -C.sub.6 branched and unbranched alkyl and alkenyl substituents;
- molding said mixture;
- and
- curing said mixture.
4 more elements
A method for improving the humidity resistance of foundry core members produced by the cold box method comprising:
- mixing together
- i) foundry aggregate
- ii) at least one foundry binder component component selected from the group consisting of a polyhydroxy component, a polyisocyanate component, and
- iii) a biphenyl additive present in amounts of between 0.5 and 10.5% by weight of either foundry binder component of the following formula:
- ##STR7## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 which may be the same or different, are selected from the group consisting of H and C.sub.1 -C.sub.6 branched and unbranched alkyl and alkenyl substituents, molding said mixture;
- and curing said mixture in the presence of a suitable catalyst.
3 more elements
A method for improving the mold release properties of foundry core members comprising mixing together:
- i) foundry aggregate
- ii) at least two foundry binder components comprising a polyhydroxy component and a polyisocyanate component, and
- iii) a biphenyl additive of the following formula:
- ##STR9## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 which may be the same or different, are selected from the group consisting of H and C.sub.1 -C.sub.6 branched and unbranched alkyl and alkenyl substituents;
- molding said mixture;
- and curing said mixture.
3 more elements
A polyurethane binder system comprising at least the following four component parts:
- i) a polyhydroxy resin solution;
- ii) a polyisocyanate solution, said solutions i) and ii) present in amounts to produce a cured binder in the presence of a suitable catalyst;
- iii) a part three component composed of at least one biphenyl additive of the following formula:
- ##STR11## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 which may be the same or different, are selected from the group consisting of H and C.sub.1 -C.sub.6 branched and unbranched alkyl and alkenyl substituents;
- iv) a suitable catalyst;
- and
- v) a foundry aggregate.
4 more elements
A method for improving the bench life of foundry core members produced by the cold box method comprising:
- mixing together
- i) foundry aggregate
- ii) at least two foundry binder components comprising a polyhydroxy component and a polyisocyanate component and
- iii) a bench life improving amount of a biphenyl component of the following formula:
- ##STR13## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 which may be the same or different, and are selected from the group consisting of H and C.sub.1 -C.sub.6 branched and unbranched alkyl and alkenyl substituents, molding said mixture and curing said mixture in the presence of a suitable catalyst.
2 more elements
A solution comprising;
- a methylene biphenyldiisocyanate and one or more additives having the following formula:
- ##STR15## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 which may be the same or different, are selected from the group consisting of H and C1-C6 branched and unbranched alkyl and alkenyl substituents, with the proviso that when one of said additives is phenylbenzene (R.sub.1 -R.sub.6 are each hydrogen) it is present in amounts of less than 1% by weight of the polyisocyanate and a second additive of the formula above is present wherein R.sub.1 and R.sub.6 are not each hydrogen.
A solution comprising;
- a polyhydroxy resin and one or more additives having the following formula:
- ##STR16## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 which may be the same or different, are selected from the group consisting of H and C1-C6 branched and unbranched alkyl and alkenyl substituents, wherein the additives are present in an amount between 0.5 and 80% by weight of the polyhydroxy resin, with the proviso that when one of said additives is phenylbenzene (R.sub.1 -R.sub.6 are each hydrogen) it is present in amounts of less than 1% by weight of the polyhydroxy resin and a second additive of the formula above is present wherein R.sub.1 and R.sub.6 are not each hydrogen.
Dependencies are inferred from the claim text.