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MDI base polyurethane prepolymer with low MDI monomer content

A technology of prepolymers and polyurethane adhesives, which is applied in 4 fields and can solve problems such as reduced product performance, serious health and safety, and hidden dangers

Inactive Publication Date: 2002-11-20
코임유에스에이인크
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since residual polyisocyanates can pose serious health and safety hazards and degrade product performance, many products and methods have been proposed to reduce residual polyisocyanate levels

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 4186 grams of methylene diisocyanate (MDI) was charged to the reactor and heated to 80°C, followed by the addition of 1264 grams of PPG 725. The reaction temperature was maintained at 80°C overnight. Excess residual MDI was removed from the reaction product by distillation under reduced pressure to a residual MDI content of 0.63% by weight and a total NCO percentage of 6.74% by weight.

Embodiment 2

[0052] 606 grams of MDI were added to the reactor and heated to 80°C, followed by the addition of 897 grams of PPG725. The reaction temperature was maintained at 80°C overnight. The percentage of NCO in the reaction product was 6.49% by weight.

Embodiment 3

[0054] 4192 grams of MDI was added to the reactor and heated to 80°C, followed by 1143 grams of PPG 2025 and 246 grams of tripropylene glycol (TPG). The reaction temperature was maintained at 80°C overnight. Excess residual MDI was removed from the reaction product by distillation under reduced pressure to a residual MDI content of 0.40% by weight and a total NCO percentage of 6.57% by weight.

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PUM

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Abstract

A prepolymer composition comprises a reaction product of 4,4'-diphenylmethane diisocyanate (MDI) with a polyol composition comprising a propylene oxide based polyether polyol. The prepolymer composition consists of at least 80 weight (wt.%) perfect prepolymers and less than 2 wt.% free MDI monomer. Independent claims are included for the following: (1) An improved polyurethane adhesive composition which comprises a polyurethane prepolymer composition and optionally an isocyanate-reactive curative; and (2) A method for adhesively joining or sealing two substrates using a polyurethane adhesive composition, which involves applying polyurethane adhesive composition on a substrate and contacting the adhesive to another substrate, such that a bond is formed.

Description

field of invention [0001] The present invention relates to 4,4'-diphenylmethane diisocyanate (MDI) based polyurethane prepolymers having a controlled structure. Background of the invention [0002] Isocyanate-terminated prepolymers are commonly used to produce polyurethane and / or polyurea products such as elastomers, foams, coatings, adhesives, sealants, caulks and adhesives. However, prepolymer production processes often result in high residual concentrations of polyisocyanates used in prepolymer synthesis. Residual polyisocyanates pose potential health and safety hazards and can also impair the performance and quality of end-use products. For example, residual polyisocyanate can lead to an undesirable loss in open time, product instability, increased moisture sensitivity, and reduced adhesion due to migration of these molecules to the interface. A polyurethane prepolymer with a controlled residual polyisocyanate content, preferably less than 1% by weight, can reduce heal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/12C08G18/42C08G18/48C08G18/76C09J109/00C09J175/04C09J175/06C09J175/08
CPCC08G18/10C08G18/7671C09J175/04C08G18/76
Inventor A·K·史密斯R·J·戈达德E·J·L·保尔森
Owner 코임유에스에이인크
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