Soft Ionomeric TPU


 Number/Link: US20160347900

Applicant/Assignee: Univ. Akron; Covestro

Publication date: 1-Dec-2016

Gist”: TPU is prepared with ionomeric groups having bulky counter-ions

Why it is interesting: According to this invention a novel type of plasticized thermoplastic polyurethane can be made  by incorporating as chain extender a diol containing an ionic group with a bulky counter ion. It is said that the steric hindrance of the bulky counter ions creates additional free volume that softens the polymer and lowers the melt viscosity. In the examples N,N-bis(2-hydroxyethyl)-2-aminoethane sulfonic acid (BES) is used together with bulky alkylammonium cations. The softest TPU shown has a 37 Shore A hardness at 25% hardblock content and 7.6 mole% BES-tetrakis(decyl)ammonium. This accounts for a 35 point hardness decrease compared to an ionomer-free control sample.

N,N-bis(2-hydroxyethyl)-2-aminoethane sulfonic acid

N,N-bis(2-hydroxyethyl)-2-aminoethane sulfonic acid

Hydrophilic PU Foams from Sulfonated Polyols


 Number/Link: WO2016/044512

Applicant/Assignee: 3M

Publication date: 24-03-2016

Gist”: Use of sulfonated polyols to make hydrophilic foams

Why it is interesting: Hydrophilic polyurethane foams are well known and often made using polyols with a high ethyleneoxide content.  According to this invention, open celled, hydrophilic foams can be made using a polyol blend containing polyols (or polyamines) having charged functional groups. In the examples a polymeric MDI is reacted with a polyol blend of a 3000MW, 8% EO, triol with up to 40% (w/w) of a sulfonated diol. The sulfonated diol is prepared by reacting 0.25 moles of  dimethyl sodium 5-sulfoisophthalate with 1 mole of PEG 600. The foams have properties useful for use as household sponges.

Dimethyl sodium 5-sulfoisophthalate

Dimethyl sodium 5-sulfoisophthalate

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