Process for producing fiber-reinforced molded products

C - Chemistry – Metallurgy – 08 – K

Patent

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18/1111, 18/1166

C08K 7/02 (2006.01) C08G 18/72 (2006.01)

Patent

CA 1147123

Mo-2168 LeA 19,931 PROCESS FOR PRODUCING FIBER- REINFORCED MOLDED PRODUCTS ABSTRACT OF THE DISCLOSURE The instant invention is directed to a process for the production of fiber-reinforce molded products, comprising: (1) mixing at a temperature of from 10 to 50°C, (a) 7 to 35% by weight of a polyisocyanate having a melting point above 100°C, and (b) 14 to 35% by weight of a polyisocyanate which is liquid at the reaction tempera- ture of mixing with (c) 43 to 62% by weight of one or more compounds having molecular weights of 300 to 10,000 containing 2 to 8 hydroxyl groups, and (d) 3 to 10% by weight of a chain-lengthening agent having a molecular weight of 62 to 250 containing 2 to 4 hydroxyl groups, (e) 0 to 5% by weight of a compound having a molecular weight below 1,000 contain- ing from 2 to 4 amino groups or an equivalent quantity of water, (f) 0 to 5% by weight of a molecular sieve of the sodium aluminum silicate type, and (g) 0 to 5% by weight of one or more activators, all percentages being based on the total weight of (a) through (g) and components (b) through (e) being liquid at the chosen reaction temperature of mixing and having an average functionally of isocyanate-reactive groups of 2.5 to 3.5, the equivalent ratio of isocyanate groups in component (b) to isocyanate-reactive hydrogen atoms in LeA 19,931 components (c) through (e) being from 0.4:1 to 0.85:1 and the equivalent ratio of isocyanate groups in component (a) to isocyanate-reactive hydrogen atoms in components (c) through (e), taking into account any masked isocyanate groups being from 0.15:1 to 1.2:1, with the proviso that the average functionality or components (c) through (e) should be at least 2.65 when the first-mentioned equivalent ratio is less than or equal to 0.65:1 and not more than 3.0 when the equivalent ratio is greater than or equal to 0.70:1; (2) adding a fiber material having a fiber length or from 10 to 100 mm; and (3) after storing for from one hour to four days curing and shaping the molding compound at a temperature above 90°C and at a pressure of from 20 to 300 bars. LeA 19,931

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