Unlock instant, AI-driven research and patent intelligence for your innovation.

Emulsifiable isocyanate compositions

a polyisocyanate and composition technology, applied in the field of polyisocyanate derived adducts, can solve the problems of water present, isocyanate group reaction, reducing the working life of emulsifiable polyisocyanate, etc., and achieve the effect of increasing stability and improving stability

Inactive Publication Date: 2002-04-11
HUNTSMAN INT LLC
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] In yet another aspect, the invention relates to an aqueous emulsion having greatly improved stability. The aqueous emulsion includes emulsifiable polyisocyanate. The emulsifiable polyisocyanate includes an isocyanate and a polyisocyanate derived adduct. The polyisocyanate derived adduct includes the reaction product of a urethane prepolymer and a capping agent. The capping agent may be any of methoxypolyoxyethylene monols, polyoxyethylene-polyoxypropylene monols, and mixtures thereof. The urethane prepolymer is the reaction product of a dihydroxy functional polyol and an isocyanate. The urethane prepolymer and the capping agent can be present in a weight ratio of urethane prepolymer to capping agent of about 2:1 to about 1:2, the dihydroxy functional polyol and the isocyanate can be present in a weight ratio of dihydroxy functional polyol to isocyanate of about 2:1 to about 25:1, and the capping agent and urethane prepolymer are present in a weight ratio of the capping agent to the prepolymer of about 1:1 to about 1:3.

Problems solved by technology

In the case of isocyanate-reactive coatings, however, water presents a problem in that the isocyanate groups react with water.
These adducts, however, tend to react with water to form urea reaction products which reduce the working life of the emulsifiable polyisocyanate.
Moreover, exposure of these emulsifiable polyisocyanates to heat can form undesirable polyureas which greatly reduces the pot life of the emulsifiable polyisocyanate.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0047] The first embodiment entails a single step procedure wherein a mono-hydroxy functional monol is reacted with a polyisocyanate to produce the adduct. The total amount of monol added is a stoichiometric equivalent or more with respect to the polyisocyanate. Preferably, the polyols are Carbowax MPEG and Ucon polyols, alone or in combination. The amount of polyol added is sufficient to consume about 99%, preferably 100% of the isocyanate functionality so as to not leave any isocyanate reactive functionality in the resulting polyisocyanate derived adduct.

[0048] The alchol(s) are added at a controlled rate to the polyisocyanate in order to maintain the reaction temperature between about 50.degree. C. to about 100.degree. C., preferably about 70.degree. C. to about 80.degree. C., most preferably below about 85.degree. C. The total amount of monol added to the polyisocyanate is from about 0.95 of an equivalent per equivalent of polyisocyanate, preferably from about 0.99 to 1.03 of mo...

second embodiment

[0050] The second embodiment for manufacture of the polyisocyanate derived adducts of the invention entails a two step procedure. Step one entails reacting a di-hydroxy functional polyol with polyisocyanate to make a polyisocyanate terminated intermediate at a reaction temperature of about 70.degree. C. to about 80.degree. C. The amount of di-hydroxy functional polyol reacted with the polyisocyanate is less than one stoichiometric equivalent with respect to the polyisocyanate. The amount of polyol reacted with the polyisocyanate is preferably not less than about 0.85 of an equivalent per equivalent of isocyanate, more preferably from about 0.90 to 0.97 of polyol to isocyanate equivalent. In step two, a mono-hydroxy functional alchol is reacted with the polyisocyanate terminated intermediate made in the first step. The amount of mono-hydroxy functional monol employed is sufficient to consume about 99%, preferably 100% of the isocyanate functionality without leaving any of the remaini...

example 1

[0062] A round-bottom flask and a stir blade are preheated to 60.degree. C. for further use. 26.31 g of Rubinate 44 is placed into the preheated round-bottom flask equipped with stir blade, stir bearing, stir shaft, nitrogen inlet, thermocouple, temperature controller, heating mantle, and a stopper to produce a reaction mixture. 73.69 g Carbowax MPEG 350 at a temperature of 60.degree. C. is added into the flask to produce a reaction mixture. The reaction temperature is increased from 60.degree. C. to 75.degree. C. over 60 minutes at the heating rate of 0.25.degree. C. / min., and the reaction mixture is allowed to react for 2-3 hours at 75.degree. C. to produce a polyisocyanate derived adduct. The reaction end, identified by infrared analysis, is indicated by no evidence of isocyanate. The structure of the resulting polyisocyanate derived adduct is Carbowax MPEG 350 capped 4,4' MDI. The adduct has a number average molecular weight of 950 as determined by gel permeation chromatography....

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
weight percentaaaaaaaaaa
weight percentaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The disclosed invention relates to polyisocyanate derived adducts and to emulsifiable polyisocyanates formed from those adducts. The invention further relates to emulsions which include the emulsifiable polyisocyanates. Emulsions which employ the emulsifiable polyisocyanates have greatly increased stability.

Description

[0001] This invention relates to polyisocyanate derived adducts, to emulsifiable polyisocyanates which employ those adducts, and to emulsions which include the emulsifiable polyisocyanates.[0002] The use of water based coatings is important due to environmental considerations. In the case of isocyanate-reactive coatings, however, water presents a problem in that the isocyanate groups react with water. In order to overcome this disadvantage, the prior art has used emulsifiable adducts which are the reaction products of polyisocyanates and hydroxy functional polyethers. These adducts have latent isocyanate functionality to assist in crosslinking of the water based coating and sufficient hydrophilic character to keep the water based coating composition dispersed in an aqueous medium. These adducts, however, tend to react with water to form urea reaction products which reduce the working life of the emulsifiable polyisocyanate. Moreover, exposure of these emulsifiable polyisocyanates to...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): C08G18/00C08G18/10C08G18/28C08G18/36C08G18/62C08G18/70C08G18/48C08G18/76C08G18/79C09D175/04
CPCC08G18/10C08G18/283C08G18/36C08G18/6212C08G18/706C09D175/04C08G18/797
Inventor SHEN, CHIN-CHANGYAVORSKY, JAMES A.
Owner HUNTSMAN INT LLC