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US 4,530,941 AGranted
Reaction injection molded polyurethanes employing high molecular weight polyols
AssigneeThe Dow Chemical Company
InventorsRobert B. Turner, Richard D. Peffley, James A. Vanderhider
Life of this patent
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Abstract
Reaction injection molded polyurethanes prepared from a composition comprising (A) a relatively high molecular weight polyol, (B) a chain extender and (C) a polyisocyanate or polyisothiocyanate are improved by replacing a portion of the relatively high molecular weight polyol with an aminated or partially aminated polyoxyalkylene material.
Claims24
In a process for preparing molded polymer systems which systems employ a composition which comprises
- (A) at least one relatively high molecular weight hydroxyl-containing polyol;
- (B) at least one chain extender;
- and
- (C) at least one polyisocyanate, polyisothiocyanate or mixture thereof;
- the improvement which comprises replacing at least a portion of component (A) with
- (D) a material or mixture of materials having an average equivalent weight of at least 500 and which contains a plurality of oxyalkylene groups and at least one primary or secondary amine group per molecule with the proviso that when such material contains only one primary or secondary amine group per molecule, it also contains at least one other group containing a hydrogen atom reactive with NCO and/or NCS group per molecule;
- and wherein
- (i) of the total number of hydrogen equivalents contributed by hydroxyl groups and amine groups in components (A) and (D), from about 25 to about 100 percent of such hydrogen equivalents are derived from amine groups;
- and
- (ii) the NCX index is from about 0.6 to about 1.5 with the proviso that when the system contains an NCX trimerization catalyst, the NCX index can be as high as about 5.
7 more elements
A composition comprising
- (A) an active hydrogen-containing composition comprising
- (1) at least one material containing at least one primary or secondary amine group per molecule and has an average equivalent weight of at least about 500;
- and
- (2) optionally a polyol or mixture of polyols whose source of active hydrogen atoms is derived only from groups other than primary or secondary amine groups, has an average active hydrogen equivalent weight of at least 500;
- with the proviso that if polyol (A-1) has only one primary or secondary amine group per molecule, then it also has at least one other group reactive with an NCO and/or NCS group per molecule and wherein in component (A) from about 25 to about 100 percent of the active hydrogen equivalents contained therein are derived from amine groups;
- and
- (B) as a chain extender composition, one or more members selected from
- (1) an aliphatic amine-containing material having at least one primary amine group or a mixture of such materials, which material or mixture of materials has an average aliphatic amine hydrogen functionality of from about 2 to about 16, and an average aliphatic amine hydrogen equivalent weight of from about 15 to about 500;
- (2) a hydroxyl-containing material free of aliphatic amine hydrogen atoms or mixture of such materials, which material or material mixture has an average OH functionality of from about 2 to about 4, and an average OH equivalent weight of from about 30 to about 120;
- (3) an aromatic amine-containing compound which is essentially free of aliphatic amine hydrogens and which contains at least 2 aromatic amine hydrogen atoms or a mixture of such materials;
- (4) mixtures thereof;
- and wherein
- (i) when component (B) has an average equivalent weight of less than about 50, component (B) is present in quantities of from about 5 to about 60, percent by weight of component (A);
- (ii) when component (B) has an average equivalent weight of from about 50 to about 150, component (B) is present in quantities of from about 5 to about 90, percent by weight of component (A);
- (iii) when component (B) has an average equivalent weight of greater than about 150, component (B) is present in quantities of from about 5 to about 120, percent by weight of component (A);
- and
- (iv) equivalent weight is the average molecular weight divided by the total number of hydrogen atoms attached to an oxygen atom or a nitrogen atom.
14 more elements
Dependencies are inferred from the claim text.