Water-soluble copolymer composition
The present invention relates to the field of water-soluble or water-dispersible copolymers comprising at least one random copolymer comprising styrene, methacrylic acid, acrylic acid and butyl acrylate.
1. A composition comprising a random copolymer comprising units derived from the following monomers:
styrene, from 28% to 45% by weight, limits included;
methacrylic acid, from 10% to 40% by weight, limits included;
acrylic acid, from 0.5% to 5% by weight, limits included;
butyl acrylate, from 18% to 35% by weight, limits included.
2. The composition as claimed in claim 1 , wherein the random copolymer is prepared by controlled radical polymerization.
3. The composition as claimed in claim 1 , wherein a weight-average molecular weight of the random copolymer is between 30 000 and 300 000 g/mol.
4. The composition as claimed in claim 1 , wherein the composition has a glass transition temperature, measured by DMA, of greater than 60° C.
5. The composition as claimed in claim 2 , wherein the controlled radical polymerization is carried out by controlled radical polymerization of RAFT type.
6. The composition as claimed in claim 2 , wherein the controlled radical polymerization is carried out by controlled radical polymerization of ATRP type.
7. The composition as claimed in claim 2 , wherein the controlled radical polymerization is carried out by controlled radical polymerization of NMP type.
8. The composition as claimed in claim 7 , wherein a nitroxide from the NMP results from an alkoxyamine which is derived from a stable radical of formula (1):
wherein the radical R L exhibits a molar mass of greater than 15.0342 g/mol.
9. The composition as claimed in claim 8 , wherein the alkoxyamine is derived from the following stable radicals:
N-(tert-butyl)-1-phenyl-2-methylpropyl nitroxide,
N-(tert-butyl)-1-(2-naphthyl)-2-methylpropyl nitroxide,
N-(tert-butyl)-1-diethylphosphono-2,2-dimethylpropyl nitroxide,
N-(tert-butyl)-1-dibenzylphosphono-2,2-dimethylpropyl nitroxide,
N-phenyl-1-diethylphosphono-2,2-dimethylpropyl nitroxide,
N-phenyl-1-diethylphosphono-1-methylethyl nitroxide,
N-(1-phenyl-2-methylpropyl)-1-diethylphosphono-1-methylethyl nitroxide,
4-oxo-2,2,6,6-tetramethyl-1-piperidinyloxy,
2,4,6-tert-butylphenoxy nitroxide.
10. The composition as claimed in claim 9 , wherein the alkoxyamine is derived from N-(tert-butyl)-1-diethylphosphono-2,2-dimethylpropyl nitroxide.
11. A material comprising the composition as claimed in claim 1 , wherein the material is a pigment, a drilling mud, a textile printing paste, a cosmetic, a detergent, or a coarse inorganic or organic filler.
12. A filament extruded from the composition of claim 1 .