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US 6,147,181 AGranted
Two step procedure for the production of semi-hard solid polyurethane molded bodies
AssigneeBayer Aktiengesellschaft
InventorsErhard Michels, Klaus Pleiss, Franz Scholtis
Life of this patent
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Abstract
The invention relates to a process for preparing solid, transparent to translucent polyurethane molded items which, due to their elastic and optical properties, can be used, for instance, as an alternative material to rubber.
Claims5
A two-stage process for the production of semi-rigid, solid polyurethane molded articles having a high transparency and/or translucency, even at different thicknesses of molded articles, comprising reacting:
- a) at least one organic and/or modified organic polyisocyanate, with
- b) at least one high molecular weight compound containing at least two isocyanate-reactive hydrogen atoms, comprising
- (1) at least one OH-terminated prepolymer having an OH number of from 7 to 56 mg KOH/g, which contains no reactive isocyanate groups, and comprises the reaction product of
- (1A) a polyether polyol component being selected from the group consisting of:
- (I) a linear ethylene oxide/propylene oxide polyether polyol having terminal ethylene oxide groups, and an ethylene oxide/propylene oxide ratio of from 15:85 to 40:60, an OH number of from 28 to 56, and having a functionality of 2.0,
- (II) a mixture of (a) a polyether polyol as specified by (I) above, with (b) another higher functional ethylene oxide/propylene oxide polyether polyol initiated with glycerine, trimethylol-propane, pentaerythritol or sugar, having an ethylene oxide propylene oxide ratio of from 15:85 to 40:60, and having an OH number of from 25 to 60,
- (III) mixtures of several linear and branched polyether polyols, each of which comprises components (I) and/or (II)(b),
- (IV) a poly-tetrahydrofuran-ether having an average molecular weight of 500 to 2,000, and
- (V) mixtures thereof;
- with
- (1B) an isocyanate component being selected from the group consisting of:
- (A) isomers of toluene diisocyanate in any ratio, and/or prepolymers thereof,
- (B) toluene diisocyanate based polynuclear isocyanates and/or prepolymers thereof,
- (C) isomers of diphenylmethane diisocyanate in any ratio and/or prepolymers thereof,
- (D) diphenylmethane diisocyanate based polynuclear isocyanates and/or prepolymers thereof,
- (E) an aromatic isocyanate having a functionality of at least two and which is obtainable on an industrial scale, and/or prepolymers thereof,
- (F) an aliphatic isocyanate having a functionality of at least two and which is obtainable on an industrial scale, and/or prepolymers thereof, and
- (G) mixtures thereof;
- c) at least one low molecular weight chain extender and/or crosslinking agent,
- in the presence of, optionally,
- d) at least one amine and/or metal salt catalysts, and/or
- e) additives.
19 more elements
A two-stage process for the production of semi-rigid, solid polyurethane molded articles having a high transparency and/or translucency, even at different thicknesses of molded articles, comprising reacting:
- a) at least one organic and/or modified organic polyisocyanate, with
- b) at least one high molecular weight compound containing at least two isocyanate-reactive hydrogen atoms, comprising:
- (1) at least one isocyanate-reactive component having an OH number of from 7 to 56 mg KOH/g, which contains no reactive carboxylic acid groups, and comprises the reaction product of:
- (1A) a polyether polyol component being selected from the group consisting of:
- (I) a linear ethylene oxide/propylene oxide polyether polyol having terminal ethylene oxide groups, and an ethylene oxide/propylene oxide ratio of from 15:85 to 40:60, OH number of from 28 to 56, and having a functionality of 2.0,
- (II) a mixture of (a) a polyether polyol as specified by (I) above, with (b) another higher functional ethylene oxide/propylene oxide polyether polyol initiated with glycerine, trimethylol-propane, pentaerythritol or sugar, having an ethylene oxide/propylene oxide ratio of from 15:85 to 40:60, and having an OH number of from 25 to 60;
- and
- (III) mixtures of several linear and branched polyether polyols, each of which comprises components (I) and/or (II)(b);
- with
- (1C) a difunctional and/or higher functional carboxylic acid component;
- c) at least one low molecular weight chain extender and/or crosslinking agent,
- in the presence of, optionally,
- d) at least one amine and/or metal salt catalysts, and/or
- e) additives.
11 more elements
Dependencies are inferred from the claim text.