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Low free polyurethane prepolymer composition

A polyurethane prepolymer and composition technology, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve problems such as unmentioned prepolymer adhesive properties

Pending Publication Date: 2022-05-06
LANXESS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document is silent on the use of MDI as diisocyanate and the adhesive properties of the disclosed prepolymers

Method used

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  • Low free polyurethane prepolymer composition
  • Low free polyurethane prepolymer composition
  • Low free polyurethane prepolymer composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Example 1 (invented)

[0111] 6046 g of 4,4'-methylene diphenyl diisocyanate (4,4'-MDI) was added to the reactor and heated to 50°C. Then, 2896g of PPG-500 and 1646g of PPG-1100 were added. The reaction temperature was maintained at 80°C for 4 hours. Excess residual 4,4'-MDI monomer was removed from the reaction product by thin-film distillation under reduced pressure to a level of less than 0.1 wt.% residual 4,4'-MDI and a total NCO content % of 6.05 wt.% .

Embodiment 2

[0112] Embodiment 2 (invented)

[0113] 2880 g of 4,4'-MDI was added to the reactor and heated to 50°C. Then, 603g of PPG-500 and 1017g of PPG-1100 were added. The reaction temperature was maintained at 80°C for 4 hours. Excess residual 4,4'-MDI monomer was removed from the reaction product by thin film distillation under reduced pressure to a level of less than 0.1 wt.% residual 4,4'-MDI, and the total NCO content % was 6.10 wt.% .

Embodiment 3

[0114] Embodiment 3 (comparison)

[0115] 4182 g of 4,4'-MDI was added to the reactor and heated to 50°C. Then, 443g of PPG-500 and 1500g of PPG-1100 were added. The reaction temperature was maintained at 80°C for 4 hours. Excess residual 4,4'-MDI monomer was removed from the reaction product by thin film distillation under reduced pressure to a level of less than 0.1 wt.% residual 4,4'-MDI, and the total NCO content % was 5.87 wt.% .

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Abstract

The present invention relates to a polyurethane prepolymer composition comprising more than 0 wt.% and less than 1.0 wt.% of free diisocyanate monomers, a curable composition comprising the polyurethane prepolymer compositions, and the use of the polyurethane prepolymer compositions as adhesives, wherein the polyurethane prepolymer comprises less than 80 wt.% of a 2: 1 stoichiometric adduct of a diisocyanate with at least one polyol (full prepolymer).

Description

technical field [0001] The present invention relates to a polyurethane prepolymer composition, a curable composition comprising these polyurethane prepolymer compositions and the use of these polyurethane prepolymer compositions as an adhesive (adhesive), the polyurethane prepolymer composition comprising poly At 0 wt.% and less than 1.0 wt.% free diisocyanate monomer, wherein the polyurethane prepolymer comprises less than 75 wt.% of a 2:1 stoichiometric adduct of diisocyanate and at least one polyol (completely prepolymer (perfectprepolymer)). Background technique [0002] Isocyanate-terminated polyurethane prepolymers are commonly used in the production of polyurethane products such as elastomers, foams, coatings, adhesives, sealants and binders. However, polyurethane prepolymer manufacturing processes often result in high residual concentrations of polyisocyanate monomers (polyisocyanate monomers) used in prepolymer synthesis. Residual polyisocyanates can cause potenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/12C09J175/08
CPCC08G18/7671C08G18/4808C08G18/4825C08G18/12C08G18/6674C09J175/08C08G18/3206C08G18/3215C08G18/48C08G18/3284C08G18/7692C08K3/08C08K3/346C08K3/36C08K2003/0812
Inventor 小罗纳德·M·伊曼纽尔波利娜·韦尔格拉尔德·金
Owner LANXESS INC
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