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Amphiphilic block copolymer formulations

A multi-block copolymer, copolymer technology, applied in bandages, absorbent pads, medical science, etc., can solve problems such as difficulty in polymer manufacturing, increase in viscosity, etc.

Inactive Publication Date: 2011-06-01
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This neutralization tends to increase viscosity, which leads to difficulties in polymer processing and manufacture of end-use articles

Method used

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  • Amphiphilic block copolymer formulations

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[0057] These controlled architecture amphiphilic block copolymers were synthesized using the following general scheme. Molecular weight is targeted by modulating the monomer-to-initiator concentration ([M] / [I]). The target molecular weight can thus be achieved by setting the [M] / [I] ratio, and then proceeding the polymerization to the desired conversion necessary to achieve the target molecular weight. Monomer conversion can be conveniently monitored by gas chromatography (GC) analysis or by rapid devolatilization of unreacted monomer under vacuum. These polymer samples were run neat or in solution. Typical solvents used include: dioxane, n-methylpyrrolidone, dimethylacetamide, dimethylformamide, t-butanol, n-butanol, toluene, ethylbenzene, methyl acetate, ethyl acetate, Propyl acetate, butyl acetate, ethanol, cyclohexanone, cyclopentanone, and methyl ethyl ketone. Polymerization reactions are run at ambient pressure, or run under nitrogen pressure up to 100 psi. Polymeriz...

Embodiment 1

[0066] An ABA triblock copolymer containing A blocks (PMMA / BA) and B blocks (PAA / BA) was prepared to give PMMA / BA-b-PAA / BA-PMMA / BA triblock copolymers , the A block includes polymethyl methacrylate and polybutyl acrylate and the B block is polyacrylic acid and polybutyl acrylate. The hydrophilic midblock contains about 20 wt% AA. Films of the above polymers were prepared by first dissolving the polymers in ethyl acetate followed by addition of base and / or plasticizer / diluent. These solutions were cast into thin films (about 5 mm thick) and dried under vacuum to remove all residual solvent and monomer. These polymer films were then placed in water and reweighed at various times to determine the magnitude or absorption. The results of preneutralization and plasticization are given in Table 1 below.

[0067] In each case, these pre-neutralized samples absorbed >20% of the maximum amount in less than 26 minutes. In contrast, the unneutralized sample absorbed much less than 20 ...

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Abstract

The invention relates to an amphiphilic block copolymer having an increased speed of water adsorption. The non-water soluble copolymer, having a hydrophilic middle block and hydrophobic endblocks, has a high rate water transmission and / or permeation. The increase in rate is due to neutralization, or partial neutralization of the hydrophilic block of the copolymer. Furthermore, the absorption rate can be controlled by the extent of the neutralization. Another aspect of the invention is the use of co-monomers and / or additives to further increase or tailor the water absorption properties. The use of additives and comonomers is also shown to enhance the processability of the disclosed polymer composition.

Description

technical field [0001] The present invention relates to an amphiphilic block copolymer having an increased water absorption rate. Water-insoluble copolymers having a hydrophilic mid-block and hydrophobic end-blocks have a high water transport and / or permeation rate. The increase in rate is due to the neutralization or partial neutralization of the hydrophilic block of the copolymer. Furthermore, the rate of absorption can be controlled by the degree of neutralization. [0002] Another aspect of the present invention is the use of comonomers and / or additives to further increase or tailor these water absorption properties. The use of additives and comonomers has also been shown to enhance the processability of the disclosed polymer compositions. Background technique [0003] Amphiphilic block copolymers are well known. Most amphoteric polymers are water-soluble diblock copolymers. These diblock polymers are used to thicken aqueous solutions and form viscoelastic gels, suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/02
CPCC08L53/00C08F293/005A61L15/60A61L15/24C08F293/00C08L53/005C08L71/02
Inventor S·C·施米特N·E·梅西J-P·迪森
Owner ARKEMA FRANCE SA
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