# US 2013/0158145 A1 · Polyurethane having high light refraction

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- Number: US 2013/0158145 A1
- Document ID: US20130158145A1
- Status: Published application
- Kind: A1
- Application number: 13/811,162
- Filed: 2011-07-15
- Published: 2013-06-20
- Earliest claimed: 2010-07-20
- Assignees: Bayer Intellectual Property GmbH
- Inventors: Hans-Josef Laas; Dorota Greszta-Franz; Reinhard Halpaap; Dieter Mager; Hans-Ulrich Meier-Westhues
- Web page: https://patentgrep.com/patent/US20130158145A1

## CPC

- C08G 18/76: aromatic
- C08G 18/092: {oligomerisation to isocyanurate groups}
- C08G 18/097: {oligomerisation to urethdione groups}
- C08G 18/3876: {containing mercapto groups}
- C08G 18/42: Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G 18/4211: {derived from aromatic dicarboxylic acids and dialcohols}
- C08G 18/4277: {Caprolactone and/or substituted caprolactone}
- C08G 18/664: {with compounds of group C08G18/3203}
- C08G 18/7831: {containing biuret groups}
- C08G 18/794: {formed by oligomerisation of aromatic isocyanates or isothiocyanates}
- C08G 18/798: {containing urethdione groups}
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- G02B 1/041: {Lenses}
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The present invention relates to the use of solvent-free low-monomer polyisocyanates based on araliphatic diisocyanates for the production of light- and weather-resistant polyurethane bodies having a high light refraction and low dispersion.

## Claims

### Claim 1

Method of producing light-fast compact or foamed polyurethane bodies using solvent-free polyisocyanate components A) which are built up from at least two araliphatic diisocyanates and have a content of isocyanate groups of from 10 to 22 wt. % and a content of monomeric diisocyanates of less than 1.0 wt. %.

### Claim 2 (depends on 1)

Method according to claim 1, wherein the polyisocyanate components A) have uretdione, allophanate, isocyanurate, iminooxadiazinedione and/or biuret structures.

### Claim 3 (depends on 1)

Method according to claim 1, wherein the polyisocyanate components A) are polyisocyanates based on 1,3-bis(isocyanatomethyl)benzene, 1,4-bis(isocyanatomethyl)benzene and/or 1,3-bis(2-isocyanatopropan-2-yl)benzene having a content of isocyanate groups of from 11 to 21.5 wt. % and a content of monomeric diisocyanates of less than 0.8%.

### Claim 4 (depends on 3)

Method according to claim 3, wherein the polyisocyanate components A) are polyisocyanates based on 1,3-bis(isocyanatomethyl)benzene having a content of isocyanate groups of from 15 to 21 wt. % and a content of monomeric diisocyanate of less than 0.5%.

### Claim 5 (depends on 1)

Method according to claim 1, wherein in the preparation of the polyisocyanate components A), the unreacted monomeric araliphatic diisocyanate is removed from the reaction product by extraction or thin film distillation.

### Claim 6 (depends on 1)

Method according to claim 1, which produces compact transparent polyurethane bodies.

### Claim 7 (depends on 6)

Method according to claim 6, wherein the polyurethane bodies are glass substitute parts.

### Claim 8 (depends on 6)

Method according to claim 6, wherein the polyurethane bodies are optical, optoelectronic or electronic components.

### Claim 9 (depends on 6)

Method according to claim 6, wherein the components are optical lenses or spectacle lenses.

### Claim 10 (depends on 6)

Method according to claim 6, wherein the components are light-emitting diodes.

### Claim 11

Process for the production of light-fast polyurethane bodies comprising solvent-free reacting of:
A) a polyisocyanate component which is built up from at least two araliphatic diisocyanates and has a content of isocyanate groups of from 10 to 22 wt. % and a content of monomeric diisocyanates of less than 1.0 wt. %, with
B) reaction partners which are reactive towards isocyanate groups and have an average functionality of from 2.0 to 6.0, and optionally co-using
C) further auxiliary substances and additives,
maintaining an equivalent ratio of isocyanate groups to groups which are reactive towards isocyanates of from 0.5:1 to 2.0:1.

### Claim 12 (depends on 11)

Process according to claim 11, wherein hydroxy-, amino- and/or mercapto-functional compounds having an average molecular weight of from 60 to 12,000 are employed as component B).

### Claim 13 (depends on 11)

Process according to claim 11, wherein polyether polyols, polyester polyols, polycarbonate polyols and/or aminopolyethers having an average molecular weight of from 106 to 12,000, polythioether thiols, polyester thiols, sulfur-containing hydroxy compounds and/or low molecular weight hydroxy- and/or amino-functional components having an average molecular weight of from 60 to 500 are employed as component B).

### Claim 14 (depends on 11)

Process according to claim 11, wherein catalysts, UV stabilizers, antioxidants and/or mould release agents are employed as component C.

### Claim 15 (depends on 11)

Process according to claim 11, wherein the reaction of the reaction partners is carried out at a temperature of up to 180° C. under a pressure of up to 300 bar.