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1. (WO2018162519) POLYURETHANE FORMULATIONS FOR THE PRODUCTION OF COMPOSITE ELEMENTS
注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。

Patent claims

Process for the production of a polyurethane reinforced composite comprising mixing a

A) a Polyisocyanate component comprising di- or Polyisocyanates (a) and

B) a polyol component comprising

b) compounds having at least two groups reactive toward isocyanates, c) catalyst,

d) optionally further additives,

to form a polyurethane reaction mixture,

contacting the reaction mixture with the reinforcing material at temperatures of less than 100 °C and curing the reaction mixture at temperatures of more than 100 °C to form a polyurethane reinforced composite,

wherein the catalyst (c) comprises microencapsulated polyurethane catalyst which comprises a capsule core, containing polyurethane catalyst, and an acrylic copolymer capsule shell and wherein the average particle size D(0,5) of the microcapsues is 1 to 50 μηη.

Process according to claim 1 , characterized in that the polyurethane reinforced composite is a polyurethane fiber reinforced composite.

The process according to claim 1 or 2, wherein the polyurethane catalyst is selected from the group, consisting of dibutyltin dilaurate, dioctyltin dilaurate, bismuth neodecanoate, bismuth dioctoate and bismuth ethylhexanoate or mixtures of two or more thereof.

The process according to any of claims 1 to 3, wherein the capsule core of the catalyst (c) comprises a hydrophobic core material as well as the polyurethane catalyst.

The process according to any of claims 1 to 4, wherein the acrylic copolymer is constructed of units of

(i) 50 to 90 wt.-% of at least one monomer selected from C1-C24 alkyl esters of acrylic acid, C1-C24 alkyl esters of methacrylic acid and vinylaromatics,

(ii) 5 to 20 wt.-%, of at least one monomer which has at least two ethylenic unsatura- tions, and

(iii) 0 to 30 wt.-%, of one or more other monomers, based in each case on the total weight of the monomers.

The process according to any of claims 1 to 5, wherein the monomers (i) comprise a combination of at least one monomer that after polymerization has a glass transition temperature Tg of 70°C or more with at least one monomer that after polymerization has a glass transition temperature Tg of 50°C or less.

7. The process according to any of claims 1 to 6, wherein the di- and polyisocyanates (a) used comprise polymeric MDI having an average functionality of from 2.1 to 2.8.

8. The process according to any of claims 1 to 7, wherein the compounds (b) having at least two groups reactive toward isocyanates comprise polyetherols having an average functionality of from 2 to 4 and having at least 50% content of secondary OH groups.

9. The process according to any of claims 1 to 8, wherein the average OH number of the compounds (b) having at least two groups reactive toward isocyanates is from 100 to 1000 mg KOH/g.

10. The process according to any of claims 1 to 9, wherein the viscosity of the reaction mixture is smaller than 1500 mPas at 25°C immediately after mixing of components (a) to (d).

1 1 . The process according to any of claims 1 to 10, wherein less than 2.0% by weight of substances which have a boiling point of less than 200°C at standard pressure, based on the total weight of the polyurethane reaction mixture, are added to form the polyurethane reaction mixture.

12. The process according to any of claims 1 to 1 1 , wherein the wetted fiber material is drawn through a die and hardened, where the temperature of the die is from 100°C to 250°C.

13. The process according to any of claim 1 to 12, wherein the take-off speed at which the wetted fiber material is drawn through the die is greater than one meter per minute.

14. The process according to any of claims 1 to 13, wherein the content of fiber material is from 30 to 90% by weight.

15. A polyurethane reinforced composite, capable of production by a process according to any of claims 1 1 to 14.