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US 8,409,664 B2Granted
Superabsorbent polymer particles coated with a hydrophilic elastomer and absorbent article comprising such particles
AssigneeThe Procter & Gamble Company
InventorsRobin Lynn McKiernan, Steve Daryl Smith, Axel Meyer
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Abstract
Superabsorbent polymer particles, coated with a block copolymer comprising at least four blocks being at least two hard blocks, one soft block and one hydrophilic block, wherein a the soft block is sandwiched between the hard blocks.
Claims21
Coated superabsorbent polymer particles, being coated with a block copolymer, wherein the block copolymer is obtained by the process of:
- (i) preparing a sequence of soft block(s) (A) and hard blocks (B), the sequence comprising at least three blocks being at least a first soft block, a first hard block and a second hard block wherein the first soft block is sandwiched between the first and second hard blocks (B);
- and
- (ii) combining the sequence of soft block(s) and hard blocks with a hydrophilic block (C) block, or combining the sequence of soft block(s) and hard blocks with a hydrophilic block precursor and subsequently transforming the hydrophilic block precursor into the hydrophilic block (C).
A process for making the coated superabsorbent particles comprising the steps of:
- (i) providing superabsorbent particles;
- (ii) providing a block copolymer or a coating composition comprising the block copolymer;
- (iii) coating the superabsorbent particles with the block copolymer or the coating composition;
- wherein the block copolymer is obtained by the process of:
- (i) preparing a sequence of soft block(s) (A) and hard blocks (B), the sequence comprising at least three blocks being at least a first soft block, a first hard block and a second hard block wherein the first soft block is sandwiched between the first and second hard blocks (B),
- (ii) combining the sequence of soft block(s) and hard blocks with a hydrophilic block (C) block, or combining the sequence of soft block(s) and hard blocks with a hydrophilic block precursor and subsequently transforming the hydrophilic block precursor into the hydrophilic block (C).
3 more elements
Dependencies are inferred from the claim text.