Elastomeric polyurethane material
View Patent ↗Process for preparing an elastomeric polyurethane material by reacting a polyisocyanate, a polyol and a monool.
1. A process for preparing an elastomeric polyurethane material having a shore A hardness of at most 5 (DIN 53505), a density of 500 kg/m 3 or more (DIN 53420), a compression load deflation at 40% (CLD) of 600 kPa or less (DIN 53577), and a resilience of 25% or less (ISO 8307) comprising the step of reacting:
1) a polymethylene polyphenylene polyisocyanate having an average isocyanate functionality of 2.4 or more,
2) a polymeric polyol having an average equivalent weight of at least 500 and an average nominal hydroxyl functionality of 2-4,
3) a polymer having a nominal hydroxyl functionality of 1 and an average equivalent weight of at least 500, and
4) optional additives and auxiliaries known per se in an amount of less than 5% by weight (based on the weight of the polyisocyanate, polymeric polyol 2) and polymer 3)),
wherein the reaction is conducted at an index of 90-110 and the equivalent amount of polymer 3) is 25-80% of the available NCO equivalents.
2. The process according to claim 1 wherein the average isocyanate functionality is 2.5-3.2, the polymeric polyol 2) has an average equivalent weight of 700-2000 and an average nominal hydroxyl functionality of 2, the polymer 3) has an average equivalent weight of 500-3000, and wherein the index is 90-110 and the equivalent amount of polymer 3) is 35-70% of the available NCO equivalents.
3. The process according to claim 1 wherein no plasticizer is used other than polymer 3).
4. The process according to claim 2 wherein no plasticizer is used other than polymer 3).
5. The process according to claim 1 , wherein a catalyst is used in an amount of 0.01-1% by weight based on the weight of the polyisocyanate, polymeric polyol 2) and polymer 3).
6. The process according to claim 2 , wherein a catalyst is used in an amount of 0.01-1% by weight based on the weight of the polyisocyanate, polymeric polyol 2) and polymer 3).
7. The process according to claim 3 , wherein a catalyst is used in an amount of 0.01-1% by weight based on the weight of the polyisocyanate, polymeric polyol 2) and polymer 3).
8. The process according to claim 1 , wherein the polymeric polyol 2) is a polyether diol and the polymer 3) is a polyoxyalkylene monool.
9. The process according to claim 2 , wherein the polymeric polyol 2) is a polyether diol and the polymer 3) is a polyoxyalkylene monool.
10. The process according to claim 3 , wherein the polymeric polyol 2) is a polyether diol and the polymer 3) is a polyoxyalkylene monool.
11. The process according to claim 5 , wherein the polymeric polyol 2) is a polyether diol and the polymer 3) is a polyoxyalkylene monool.
12. The process according to claim 1 wherein the index is 98-102.
13. The process according to claim 2 wherein the index is 98-102.
14. The process according to claim 1 wherein less than 2% by weight, (based on the weight of the polyisocyanate, polymeric polyol 2) and polymer 3)), of additives and auxiliaries is used.
15. The process of claim 1 wherein the material is non-blown, the CLD is 10-300 kPa and the resilience is 0-15%.
16. The process of claim 2 wherein the material is non-blown, the CLD is 10-300 kPa and the resilience is 0-15%.
17. The process of claim 3 wherein the material is non-blown, the CLD is 10-300 kPa and the resilience is 0-15%.
18. The process of claim 1 wherein the hard block ratio is 0.05-0.20 and the Shore A hardness is at most 3 (DIN 53505).
19. The process of claim 2 wherein the hard block ratio is 0.05-0.20 and the Shore A hardness is at most 3 (DIN 53505).
20. An elastomeric polyurethane material having a shore A hardness of at most 5 (DIN 53505), a density of 500 kg/m 3 or more (DIN 53420), a compression load deflation at 40% (CLD) of 600 kPa or less (DIN 53577), and a resilience of 25% or less (ISO 8307) comprising the reaction product of:
1) a polymethylene polyphenylene polyisocyanate having an average isocyanate functionality of 2.4 or more,
2) a polymeric polyol having an average equivalent weight of at least 500 and an average nominal hydroxyl functionality of 2-4,
3) a polymer having a nominal hydroxyl functionality of 1 and an average equivalent weight of at least 500, and
4) optional additives and auxiliaries known per se in an amount of less than 5% by weight (based on the weight of the polyisocyanate, polymeric polyol 2) and polymer 3)),
wherein the reaction is conducted at an index of 90-110 and the equivalent amount of polymer 3) is 25-80% of the available NCO equivalents.