27.
    发明专利
    未知

    公开(公告)号:BR9002723A

    公开(公告)日:1991-08-20

    申请号:BR9002723

    申请日:1990-06-08

    Applicant: HOECHST AG

    Abstract: Coating compsn. contains (A) a film-forming resin, (B) a cellulose ester, (C) solvent, (D) metal pigment and opt. (E) crosslinkers and (F) further lacquer additives and of the type esp. to give a multi-layer coating with a base layer and opt. a clear topcoat. (i) the cellulose ester (B) has an acetyl content of 2-30 (pref. 2-5) wt.%, a butyryl content of 17-53 (pref. 47-53) wt.% and an average mol.wt. of at least 25000, pref. 30000-60000; and (ii) this cellulose ester is introduced into the coating compsn. in the form of a pasty, thixotropic pre-mix (e.g. with the crosslinkers). The solids content of the compsn. is pref. 15-30 wt.%. The cellulose ester pre-mix pref. contains a diluent which swells the cellulose ester, esp. an aromatic or aliphatic hydrocarbon or a higher alcohol. alcohol.

    29.
    发明专利
    未知

    公开(公告)号:DE59602420D1

    公开(公告)日:1999-08-19

    申请号:DE59602420

    申请日:1996-04-25

    Applicant: HOECHST AG

    Abstract: Low-mol. wt. copolymers (I) with a wt.-average mol. wt. (Mw) of less than 3500 contain at least 20 wt.% of components with branched side chains, obtd. by the reaction of (aa) glycidyl ester(s) of satd. aliphatic monocarboxylic acids with a tert. or quat. alpha -C atom; and (ab) at least two unsatd. comonomers, at least one of which contains at least one COOH gp., under radical copolymerisation conditions. Also claimed are (i) prepn. of (I) by heating component (aa) to 210-260 degrees C and reacting with component (ab) (which contains at least 2.0 wt.% of a COOH gp.-contg. monomer) in the presence of radical initiator(s), to a degree of conversion of at least 95 (pref. at least 97.5) %; (ii) polymer mixts. contg. (I), obtd. by reaction of (aa) and (ab) as above in at least two time intervals with a constant temp. in each interval, using at least two different reaction temps., at least one of which is in the range 210-260 degrees C; (iii) polymer mixts. contg. (I) and other polymers etc.; (iv) binders for coating materials contg. (I) or the above polymer mixts.; (v) coating materials contg. binders as above and hardeners such as amino resins, capped or uncapped polyisocyanates or organic cpds. with acid and/or anhydride gps.

    30.
    发明专利
    未知

    公开(公告)号:AT164600T

    公开(公告)日:1998-04-15

    申请号:AT95106087

    申请日:1995-04-24

    Applicant: HOECHST AG

    Abstract: Low-viscosity copolymers with OH and COOH gps. (I) are obtd. by reacting (A) 3 - 50 wt.% glycidyl ester(s) of satd. aliphatic carboxylic acids with a tert. or quat. alpha -C atom and (B) 97 - 50 wt.% of at least 2 unsatd. comonomers, at least one of which contains at least one COOH gp. and at least one of which is sterically hindered, in the presence of radical initiators, and with an excess of COOH gps. in (B) wrt. epoxide gps. in (A) such that the prod. has an acid no. of at least 15 mg KOH/g. Also claimed is the above process for the prodn. of (I). Also claimed are 1-component paints with (I) as binder and formaldehyde/amino-resin reaction prods. (opt. etherated with 1 - 8 C aliphatic alcohol) as hardeners, and 2-component paints with (I) as binder and polyisocyanates or urethane-forming polyisocyanate derivs. as hardeners.

Patent Agency Ranking