Process for the manufacture of foamed or non-foamed compositions

Details Process for the manufacture of foamed or non-foamed compositions Process for the manufacture of foamed or non-foamed compositions

1980-05-29

1982-07-20

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

528 57, C08G 1814

Patent

active

043406815

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process, for the manufacture of foamed or non-foamed compositions, in which one or more organic or inorganic compounds containing at least two isocyanate groups is or are reacted in the presence of an alkaline aqueous solution, an alkaline aqueous suspension or an alkaline aqueous slurry of an alkali metal hydroxide and/or alkaline earth metal hydroxide, and of one or more catalysts and, optionally, inert fillers and/or, optionally, one or more volatile substances as blowing agents.
The subject of the invention is a process, for the manufacture of foamed or non-foamed compositions, in which one or more organic or inorganic compounds containing at least two isocyanate groups is or are reacted in the presence of an alkaline aqueous solution, an alkaline aqueous suspension or an alkaline aqueous slurry of an alkali metal hydroxide and/or alkaline earth metal hydroxide, and of one or more catalysts and, optionally, inert fillers and/or, optionally, one or more volatile substances as blowing agents, which is characterized in that a mixture of the compound or compounds containing isocyanate groups and the alkali metal hydroxide or oxide and/or alkaline earth metal hydroxide or oxide, the oxide employed preferably being calcium oxide, is added to a mixture of water and catalyst.
The inorganic isocyanates used according to the invention are described inter alia in Polyurethanes, Chemistry and Technology, volume 1, J. H. Saunders and K. C. Frisch, pages 100 to 103 and in the literature cited in this publication. The said literature is likewise specifically cited in this specification, so that these literature citations also are to be regarded as disclosures within the framework of this invention.
The isocyanates employed according to the invention include those isocyanate compounds which customarily are employed in polyurethane chemistry and which contain at least two isocyanate groups. Mixtures of isocyanates which contain a predominant amount of polyisocyanate compounds containing at least three isocyanate groups are preferably employed according to the invention. Examples of such mixtures are the isocyanates obtainable commercially under the protected names "Desmodur 44 V" and "PAPI." Mixtures of polyisocyanates which are particularly preferentially employed include the mixtures of polyisocyanates which contain virtually no diisocyanates and monoisocyanates and which are obtained by the process described in German Offenlegungsschrift No. 2,105,193. In this process a mixture of organic polyisocyanates which is obtained by phosgenation of crude aniline-formaldehyde resins and which contains a predominant amount of the diphenylmethane diisocyanate isomers and polyisocyanates with a higher number of functional groups and with more than two benzene rings in the molecule is separated into the diphenylmethane diisocyanate isomers and into the polyisocyanates with a higher number of functional groups.
Of course, the NCO pre-adducts employed in the manufacture of polyurethanes can also be used according to the invention. The NCO pre-adducts are higher molecular weight compounds which contain at least two terminal NCO groups and which preferably have a molecular weight of 500 to 10,000 and in particular of between 800 and 2,500. Preferably, these NCO pre-adducts contain 1.5 to 5% of NCO groups. These NCO pre-adducts are prepared in a known manner, by reacting higher molecular weight compounds containing OH groups with an excess of polyisocyanate. The preparation of such NCO pre-adducts is described, for example, in Angewandte Chemie 64, 523 to 531 (1952), Kunststoffe 43, 303 to 310 (1952), German Pat. No. 831,772, German Pat. No. 897,014, German Pat. No. 929,507 and U.S. Pat. No. 3,000,757.
Higher molecular weight compounds, contaning OH groups, which are suitable for the preparation of the NCO pre-adducts are, for example: polyesters, polyethers, polyester-amides, polythioethers and polyacetates.
Furthermore, higher molecular weight compounds containing terminal carboxyl, amino and mercapto gro

REFERENCES:
patent: 3108975 (1963-10-01), Lambert et al.
patent: 4176218 (1979-11-01), Demou et al.

Affiliated with

Also associated with

Rating

Process for the manufacture of foamed or non-foamed compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the manufacture of foamed or non-foamed compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the manufacture of foamed or non-foamed compositions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-250673