Isocyanate modified polymers |
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| 申请号 | US18769550 | 申请日 | 1950-09-29 | 公开(公告)号 | US2625531A | 公开(公告)日 | 1953-01-13 |
| 申请人 | WINGFOOT CORP; | 发明人 | SEEGER NELSON V; | ||||
| 摘要 | Curable elastomers are prepared by reacting a linear polyester having an hydroxyl number from 30-140 and an acid number from 0 to 12, a bifunctional additive, containing at least one primary amino and/or carboxyl group, in an amount such that the total number of primary amino and carboxyl equivalents in the additive is from 0.06 to 0.24 per mol. of polyester, and 2.4 tolylene diisocyanate, hexamethylene diisocyanate or tetramethylene diisocyanate, in an amount equal to the sum of from 1.00 to 1.20 mols. of diisocyanate per mol. of polyester plus a molar amount of diisocyanate equivalent to the molar quantity of bifunctional additive used. The additive may be a diamine, amino-alcohol, amino-acid, dicarboxylic acid, hydroxy acid, a urea, guanidine or thiourea containing a primary amino group, and may be added when the polyester and diisocyanate have been partially reacted. The products cure in a shorter time than if the additive were not included and the cured products are free from blisters. The polyester may be in part derived from unsaturated components such as maleic, fumaric dihydromuconic, and dilinoleic acids in which case sulphur, benzoyl peroxide or t-butyl hydroperoxide may be used as curing agents. Other curing agents specified are di- and other polyisocyanates and alkyl ethers of hexamethylol melamine with a 2-, 4-dihalo naphthol as accelerator. The quantity of polyisocyanate used for curing should be such that the total number of isocyanate equivalents present in the cured product is equal to the sum of from 2.80 to 3.20 per mol. of polyester plus twice the molar amount of additive used. The curing is preferably effected by dry heat, hot water and steam resulting in partial degradation. The Specification lists many compounds suitable as the bifunctional additive and for making the polyester and also gives many examples of starting mixes for the polyester. In an example a polyester having an acid number 3.5 and hydroxyl number 58.6 and derived from adipic acid, ethylene glycol and propylene glycol was reacted with 1.11 mols. of 2.4 tolylene diisocyanate and 0.06 mols. of hexamethylene diamine per mol. of polyester at 120 DEG C. for 8 1/4 hours. In similar examples adipic acid and ethanolamine were used instead of hexamethylene diamine. All three modified polyesters were cured by reaction with 0.45 mols. of additional tolylene diisocyanate per mol. of polyester at 300 DEG F. for 30 minutes. Polymers prepared without the additive p blistered on curing unless they were partially cured, remilled and then finally cured. Specifications 553,733 and 694,978 are referred to. | ||||||
| 权利要求 | 1. THE ELASTOMERIC REACTION PRODUCT RESULTING FROM THE REACTION OF A MIXTURE COMPRISING: A, A POLYESTER PREPARED FROM BIFUNCTIONAL INGREDIENTS INCLUDING AT LEAST ONE DIBASIC CARBOXYLIC ACID CONTAINING AT LEAST 3 CARBONS AND AT LEAST ONE GLYCOL, SAID POLYESTER HAVING A HYDROXYL NUMBER FROM 30 TO 140 AND AN ACID NUMBER FROM 0 TO 12, AND B, AT LEAST ONE BIFUNCTIONAL ADDITIVE SELECTED FROM THE GROUP CONSISTING OF DIAMINES, AMINO ALCOHOLS, DIBASIC CARBOXYLIC ACIDS, AMINO CARBOXYLIC ACIDS, HYDROXY CARBOXYLIC ACIDS, AND THE UREAS, GUANIDINES, AND THIOUREAS CONTAINING A PRIMARY AMINO GROUP, SAID BIFUNCTIONAL ADDITIVE CONTAINING AT LEAST ONE REACTIVE GROUP SELECTED FROM THE GROUP CONSISTING OF PRIMARY AMINO AND CARBOXYL, SAID BIFUNCTIONAL ADDITIVE BEING USED IN AN AMOUNT SUCH THAT THE TOTAL NUMBER OF-NH2 AND-COOH EQUIVALENTS PRESENT IN SAID BIFUNCTIONAL REACTANT SHALL BE FROM 0.06 TO 0.24 EQUIVALENT PER MOL OF POLYESTER, AND C, AT LEAST ONE DIISOCYANATE SELECTED FROM THE GROUP CONSISTING OF HEXAMETHYLENE DIISOCYANATE, AND TETRAMETHYLENE DIISOCYANATE, THE DIISOCYANATE BEING USED IN AN AMOUNT EQUAL TO THE SUM OF FROM 1.00 MOL TO 1.20 MOLS OF DIISOCYANATE PER MOL OF POLYESTER AND THE MOLAR AMOUNT OF DIISOCYANATE EQUIVALENT TO THE MOLS OF SAID BIFUNCTIONAL ADDITIVE USED. |
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