35.
    发明专利
    未知

    公开(公告)号:DE3517333A1

    公开(公告)日:1986-11-20

    申请号:DE3517333

    申请日:1985-05-14

    Applicant: BASF AG

    Abstract: A process for the preparation of stable dispersions of finely divided polyisocyanates, and the preparation of heat-crosslinkable isocyanate systems. Stable dispersions of finely divided polyisocyanates in a liquid which may or may not contain surfactants, protective colloids and other assistants are obtained by a method in which polyisocyanates are treated with a stabilizer in the presence of absence of the liquid, and the dispersions prepared from these are finely dispersed and/or milled under the action of high shear forces, if necessary with the addition of further stabilizer. These dispersions are useful as crosslinking agents, particularly for the preparation of heat-cross-linkable isocyanate systems.

    Thickener prepn. by monomer mixt. copolymerisation in organic solvent - contg. ethylene!-propylene! non-conjugated diene! copolymer elastomer as protective colloid

    公开(公告)号:DE2833468A1

    公开(公告)日:1980-02-07

    申请号:DE2833468

    申请日:1978-07-29

    Applicant: BASF AG

    Abstract: Thickeners are prepd. by copolymerising monomer mixts. contg., by wt., (a) 20-70% (meth)acrylic acid and/or maleic-, fumaric- and/or itaconic acid mono-esters, (b) 30-80% (meth)acrylates and/or vinyl esters of 2-4C monocarboxylic acids, (c) 0-10% (meth)accrylonitrile and/or (meth)acrylamide, (d) 0-30% opt. substd. styrene and (e) 0-2% of >=1 monomer contg. >=2 ethylenically unsatd. double bonds, in an inert solvent, by pptn. polymerisation, using polymerisation initiators. Polymerisation is at 100-150(105-125) degrees C in the presence of 2-10wt.%, w.r.t. monomers, of a C2H4-C3H6 elastomer contg. 10wt.% inter-polymerised no(-conjugated diene. The elastomer has I2-index 1-15 and Mooney viscosity (100 degrees C, ML 1+4), 30-55. The thickeners can be used inthe prepn. of printing pastes, paper coating mixts. and aq. coating compsns. Elastomer presence prevents formation of highly crosslinked copolymers which do not dissolve in aq. alkali solns. In polymerisation, the elastomers act as protective colloids and are built into the copolymer.

Patent Agency Ranking