公开(公告)号：US20240191018A1

公开(公告)日：2024-06-13

申请号：US18286773

申请日：2022-04-11

Applicant: BASF SE

Inventor： Samane MEHRAVAR ,  Manfred DARGATZ ,  Paola URIBE AROCHA ,  Daniel VON NESSEN ,  Chintankumar Jayantilal PATEL

IPC: C08G18/34 ,  C08G18/10 ,  C09D175/06

CPC classification number: C08G18/348 ,  C08G18/10 ,  C09D175/06 ,  C08G2650/36

Abstract: The present invention relates a process of the present invention for the preparation of an aqueous composition comprising a polyurethane carrying COOH groups and/or salt groups thereof, comprises the steps of (i) reacting at least one first polyisocyanate (A1) with at least one polyol carrying at least one COOH group (BX) and optionally at least one first polyol carrying no COOH group (B1) to form a first composition (C1), (ii) treating the first composition (C1) obtained in step (i) with at least one second polyol carrying no COOH group (B2), and optionally with at least one second polyisocyanate (A2), to form a second composition (C2), and (iii) optionally treating the second composition (C2) obtained in step (ii) with at least one third-polyisocyanate (A3), to form a third composition (C3), wherein step (i) is stopped at a reaction index in the range of 0.05 to 0.94, wherein reaction index=reaction rate×[mol initial NCO groups of all A1/(mol initial OH groups of all BX and, if present, mol initial OH groups of all B1)] (formula 1) wherein reaction rate=1 minus (mol NCO groups of C1/mol initial NCO groups of all A1), and to an aqueous composition comprising a polyurethane carrying COOH groups and/or salt groups thereof obtainableby this process, to a process for the preparation of an aqueous composition comprising a polyurethane/poly(meth)acrylate hybrid polymer using the aqueous composition comprising a polyurethane carrying COOH groups and/or salt groups thereof of the present invention, to aqueous compositions comprising a polyurethane/poly(meth)acrylate hybrid polymer obtainable by the this process, to coating compositions comprising the aqueous composition comprising a polyurethane carrying COOH groups and/or salt groups thereof or the aqueous compositions comprising a polyurethane/poly(meth)acrylate hybrid polymer, and to substrates coated with these coating compositions.

公开(公告)号：US20240052068A1

公开(公告)日：2024-02-15

申请号：US18038224

申请日：2021-11-15

Applicant: BASF SE

Inventor： Sebastian ROLLER ,  Quirin Maximilian KAINZ ,  Chintankumar Jayantilal PATEL ,  Rabie AL-HELLANI

IPC: C08F2/38 ,  C08F2/26 ,  C09D133/12 ,  C09D7/20

CPC classification number: C08F2/38 ,  C08F2/26 ,  C09D133/12 ,  C09D7/20

Abstract: The present invention relates process for preparing an aqueous polymer dispersion by radically initiated aqueous emulsion polymerization, which comprises polymerizing, in an aqueous polymerization medium a) in a first polymerization stage ≥0.5 and ≤15 wt % of at least one α,β-monoethylenically unsaturated C3 to C6 monocarboxylic or dicarboxylic acid (monomers A1), ≥5 and ≤40 wt % of at least one monoethylenically unsaturated compound having at least one hydroxyl group (monomers B1), ≥0-≤40 wt % of carboxyl-free (meth)acrylic esters with a cycloaliphatic structure (monomers C1), ≥15 and ≤94.5 wt % of at least one ethylenically unsaturated compound which is different from the monomers A1, B1 and C1 (monomers D1), the amounts of the monomers A1 to D1 adding up to 100 wt %, in the presence of at least one radical initiator and at least one chain transfer agent, and also, optionally, in the presence of a dispersing assistant, with the provisos that ⋅the amount of chain transfer agent is selected such that the polymer 1 obtained from the first polymerization stage has a weight-average molecular weight in the range of ≥5000 and ≤40000 g/mol, ⋅the nature and amounts of the monomers A1 to D1 are selected such that the resulting polymer 1 has a glass transition temperature Tg1 as measured to DIN EN ISO 11357-2 (2013 September) ≥15° C., and thereafter polymerizing, in the presence of the polymer 1 b) in a second polymerization stage ≥0 and ≤1.0 wt % of at least one α,β-monoethylenically unsaturated C3 to C6 monocarboxylic or dicarboxylic acid (monomers A2), ≥0.1 and ≤40 wt % of at least one monoethylenically unsaturated compound having at least one hydroxyl group (monomers B2), ≥0-≤40 wt % of carboxyl-free (meth)acrylic esters with a cycloaliphatic structure (monomers C2) ≥30 and ≤99.9 wt % of at least one ethylenically unsaturated compound which is different from the monomers A2, B2 and C2 (monomers D2), the amounts of the monomers A2 to D2 adding up to 100 wt %, in the presence of at least one radical initiator and at least one chain transfer agent, and also, optionally, in the presence of a dispersing assistant, with the provisos that ⋅the weight ratio of the sum of the total amounts of monomers A1 to D1 (total monomer amount 1) to the sum of the total amounts of monomers A2 to D2 (total monomer amount 2) is in the range 25:75 to 50:50, ⋅the amount of chain transfer agent in the second polymerization stage is selected such that the overall polymer obtained after the second polymerization stage has a weight-average molecular weight ≥5000 and ≤75000/mol, and ⋅the amount of the dispersing assistant is ≤3.0 wt %, based on the sum of total monomer amount 1 and total monomer amount 2 (total monomer amount), ⋅that the sum of the total amounts of monomers C1 and C2 is 7 to 40 wt % based on the sum of total monomer amount 1 and total monomer amount 2; the aqueous polymer dispersion itself, its use and coating compositions comprising the aqueous polymer dispersion.