Wetting agents and dispersants based on mixtures of structured copolymers

Abstract

The invention relates to compositions containing two structured linear copolymers selected from the group consisting of block copolymers and gradient copolymers, said copolymers being produced according to differently controlled polymerization technologies and the difference of polydispersity of these copolymers being Delta(Mw / Mn) = 0.25. The invention also relates to the production of such mixtures and their use as wetting agents and dispersants.

Description

technical field

[0001] The present invention relates to a mixture of two linear structured copolymers by the choice of two different polymerization techniques and different molecular weight distributions (polydispersities) M w / M n and the copolymers are suitable as dispersants for the treatment of pigments and as additives for coating materials and molding formulations. The invention also relates to the use of said mixtures as wetting and dispersing agents. Background technique

[0002] In recent years, a large number of controlled polymerization methods suitable for the preparation of block copolymers have been developed. These methods include, for example, the reversible addition-fragmentation chain transfer (RAFT) method, which is also known as MADIX and addition-fragmentation chain transfer when certain polymerization regulators are used. For example in Polym.Int.2000,49,993, Aust.J.Chem.2005,58,379, J.Polym.Sci.Part A: Polym.Chem.2005,43,5347, US 6 291 620, WO 98 R...

Examples

Embodiment Construction

[0059] Preparation of Polymers and Polymer Mixtures of the Invention

[0060] Polymer 1 (Comparative example, random copolymer A prepared by radical polymerization)

[0061] 41.29 g of 1-methoxy-2-propyl acetate were heated to 135°C in a reaction vessel under an inert atmosphere (nitrogen). Then 7.8 g of 2-hydroxyethyl methacrylate, 7.85 g of 2-(N,N-dimethylamino)ethyl methacrylate, 9.76 g of styrene, 21.4 g of n-butyl acrylate were metered in over a period of 4 hours , a mixture of 1.58 g of 2-ethylhexyl acrylate and 0.5 g of tert-butyl peroxybenzoate. The post-reaction time was 1 hour. Thereafter, a mixture of 8.78 g of 1-methoxy-2-propyl acetate and 0.2 g of tert-butyl peroxybenzoate was metered in over a period of 60 minutes. The post reaction time was 2 hours.

[0062] m n =11450g / mol

[0063] m w / M n =2.21

[0064] Formation of ionic groups:

[0065] 80 g of the polymer solution were reacted with 4.88 g of benzoic acid and 8.72 g of tert-butylphenyl glycidyl ...

technical field

[0001] The present invention relates to a mixture of two linear structured copolymers by the choice of two different polymerization techniques and different molecular weight distributions (polydispersities) M w / M n and the copolymers are suitable as dispersants for the treatment of pigments and as additives for coating materials and molding formulations. The invention also relates to the use of said mixtures as wetting and dispersing agents. Background technique

[0002] In recent years, a large number of controlled polymerization methods suitable for the preparation of block copolymers have been developed. These methods include, for example, the reversible addition-fragmentation chain transfer (RAFT) method, which is also known as MADIX and addition-fragmentation chain transfer when certain polymerization regulators are used. For example in Polym.Int.2000,49,993, Aust.J.Chem.2005,58,379, J.Polym.Sci.Part A: Polym.Chem.2005,43,5347, US 6 291 620, WO 98 R...

Examples

Embodiment Construction

[0059] Preparation of Polymers and Polymer Mixtures of the Invention

[0060] Polymer 1 (Comparative example, random copolymer A prepared by radical polymerization)

[0061] 41.29 g of 1-methoxy-2-propyl acetate were heated to 135°C in a reaction vessel under an inert atmosphere (nitrogen). Then 7.8 g of 2-hydroxyethyl methacrylate, 7.85 g of 2-(N,N-dimethylamino)ethyl methacrylate, 9.76 g of styrene, 21.4 g of n-butyl acrylate were metered in over a period of 4 hours , a mixture of 1.58 g of 2-ethylhexyl acrylate and 0.5 g of tert-butyl peroxybenzoate. The post-reaction time was 1 hour. Thereafter, a mixture of 8.78 g of 1-methoxy-2-propyl acetate and 0.2 g of tert-butyl peroxybenzoate was metered in over a period of 60 minutes. The post reaction time was 2 hours.

[0062] m n =11450g / mol

[0063] m w / M n =2.21

[0064] Formation of ionic groups:

[0065] 80 g of the polymer solution were reacted with 4.88 g of benzoic acid and 8.72 g of tert-butylphenyl glycidyl ...