Rim process for the production of elastic moldings
First Claim
1. In a process for the production of polyurethane elastomer moldings having a compact surface skin from a reaction mixture by a reaction injection molding process, wherein said reaction mixture comprises the following components:
- (a) 4,4'"'"'-diisocyanatodiphenylmethane,polyisocyanates based on 4,4'"'"'-diisocyanatodiphenylmethane or mixtures thereof;
(b) hydroxyl group containing compounds having molecular weights of from 1800 to 12,000;
(c) a chain extender; and
(d) a catalyst for the reaction between hydroxyl groups and isocyanate groups;
the improvement wherein said chain extender is miscible with component (b) in any proportion and is an active aromatic diamine having alkyl groups of from 1 to 3 carbon atoms in the ortho-positions to each amino group, and wherein said components are processed via the one-shot process whereby (a) is mixed simultaneously either with (b), (c), and (d) or with a non-reacted premixture of some or all of (b), (c), and (d) or with a non-reacted premixture of some or all of (b), (c) and (d), with the proviso that at least two of said alkyl substituents contain 2 or 3 carbon atoms.
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Accused Products
Abstract
The instant invention relates to a one-step process for the production of elastomeric moldings which have a compact surface by the technique of reaction injection molding, using highly reactive systems of specific polyisocyanates, polyhydroxyl compounds and specific active aromatic polyamines. The instant invention further relates to active hydrogen containing blends useful in preparing elastomeric moldings, said blends comprising polyhydroxyl compounds, and specific active aromatic diamines. The blends herein may also contain catalyst for the reaction between hydroxyl groups and isocyanate groups.
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Citations
46 Claims
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1. In a process for the production of polyurethane elastomer moldings having a compact surface skin from a reaction mixture by a reaction injection molding process, wherein said reaction mixture comprises the following components:
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(a) 4,4'"'"'-diisocyanatodiphenylmethane,polyisocyanates based on 4,4'"'"'-diisocyanatodiphenylmethane or mixtures thereof; (b) hydroxyl group containing compounds having molecular weights of from 1800 to 12,000; (c) a chain extender; and (d) a catalyst for the reaction between hydroxyl groups and isocyanate groups; the improvement wherein said chain extender is miscible with component (b) in any proportion and is an active aromatic diamine having alkyl groups of from 1 to 3 carbon atoms in the ortho-positions to each amino group, and wherein said components are processed via the one-shot process whereby (a) is mixed simultaneously either with (b), (c), and (d) or with a non-reacted premixture of some or all of (b), (c), and (d) or with a non-reacted premixture of some or all of (b), (c) and (d), with the proviso that at least two of said alkyl substituents contain 2 or 3 carbon atoms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An active hydrogen containing blend for use in the production of polyurethane moldings comprising:
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(a) an organic hydroxyl group containing compound having a molecular weight of from 1,800 to 12,000, and (b) a chain extender which is miscible with polyhydroxyl compounds in any proportion and is selected from the group consisting of active aromatic diamines, having alkyl groups of from 1 to 3 carbon atoms in the ortho-position to each amino group, with the proviso that at least two of said alkyl substituents contain 2 or 3 carbon atoms. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. In a process for the production of polyurethane elastomer moldings having a compact surface from a reaction mixture by a reaction injection molding process, wherein said reaction mixture comprises the following components:
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(a) 4,4'"'"'-diisocyanatodiphenylmethane, polyisocyanates based on 4,4'"'"'-diisocyanatodiphenylmethane or mixtures thereof; (b) hydroxyl group containing compounds; (c) a chain extender; and (d) a catalyst for the reaction between hydroxyl groups and isocyanate groups; the improvement wherein said chain extender is miscible with polyhydroxyl compounds in any proportion and is selected from the group consisting of active aromatic diamines, which contain at least one alkyl substituent in the ortho-position to a first amino group and two alkyl substituents in the ortho-position to a second amino group, or mixtures thereof, with the proviso that at least two of said alkyl substituents contain at least two carbon atoms, and where said components (a), (b), (c) and (d) are processed via the one-shot process whereby (a) is mixed simultaneously either with (b), (c) and (d) or with a non-reacted premixture of some or all of (b), (c), and (d). - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. An active hydrogen containing blend for use in the production of polyurethane moldings comprising:
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(A) an organic hydroxyl group containing compound, and (B) from 5 to 50 percent by weight based on the weight of (A) of a chain extender which is miscible with polyhydroxyl compounds in any proportion and is selected from the group consisting of aromatic diamines which contain at least one alkyl substituent in the ortho-position to a first amino group and two alkyl substituents in the ortho-position to a second amino group or mixtures thereof, with the proviso that at least two of said alkyl substituents contain at least two carbon atoms. - View Dependent Claims (41, 42, 43, 44, 45, 46)
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Specification