All posts tagged memory foam

Flexible PU Foam with Very Low Resilience

Patent Title: LOW-RESILIENCE POLYURETHANE FOAM AND PRODUCTION METHOD THEREOF

 Number/Link: US2016/0024268

Applicant/Assignee: Mitsui

Publication date: 28-01-2016

“Gist”: Use of trans-BIC in viscoelastic flex foam

Why it is interesting: According to this invention low resilience flexible foams can be produced by reacting a mixture of two (optionally three) polyether polyols, water, a crosslinker and a catalyst with 1,4-bis(isocyanatomethyl)cyclohexane (BIC) where the BIC consists of (pref) 90% or more of the trans isomer. Higher trans-isomer is said to result in higher airflow and a finer cellstructure. In the examples a high MW all-PO triol and a low MW EO/PO triol with 18% EO tip is used, together with BIC at an NCO index of 70%.  The resulting foams have a high airflow and a (very) low resilience at densities between 50 and 70 kg/m³. While trans-BIC is clearly an interesting aliphatic di-iso, it is not widely available.

trans-1,4-bis(isocyanatomethyl)cyclohexane

trans-1,4-bis(isocyanatomethyl)cyclohexane

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by Gerhard Bleys on January 29, 2016  •  Permalink
Posted in Flexible Foams, Isocyanates and Prepolymers
Tagged , , , , , , , ,

Posted by Gerhard Bleys on January 29, 2016

https://purpatents.com/2016/01/29/flexible-pu-foam-with-very-low-resilience/

SHSM Polyurethanes

Title: SHAPE-MEMORY-SELF-HEALING POLYMERS (SMSHPS)

 Number/Link: WO2015119688

Applicant/Assignee: University of Florida

Publication date: 13-08-2015

“Gist”: Self-healing shape memory polyurethanes made by incorporation of DA adducts in-chain

Why it is interesting: According to this invention self-healing shape memory polyurethanes can be prepared by incorporating Diels-Alder (DA) adducts into the PU network such that the DA adducts do not contribute to the crosslinking.  In this manner the material can be heated above Tg without breaking crosslinks thereby inhibiting permanent distortion of the memorised shape. The Tg is also chosen such that it is lower than the temperature at which the retro-DA reaction readily occurs. The DA adducts can be introduced using a DA adduct-containing diol as for example the adduct of a furfuryl alcohol and N-(2-hydroxyethyl)maleimide.  The SHSM polyurethanes are said to be useful for coatings and moulded materials.

Diol containing a Diels-Alder adduct

Diol containing a Diels-Alder adduct

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by Gerhard Bleys on August 14, 2015  •  Permalink
Posted in Adhesives-Coatings, Elastomers
Tagged , , , , , , ,

Posted by Gerhard Bleys on August 14, 2015

https://purpatents.com/2015/08/14/shsm-polyurethanes/

Flexible Foams with Improved Thermal Comfort

Title: IN-SITU GELATINOUS TRIBLOCK COPOLYMER ELASTOMERS IN POLYURETHANE FLEXIBLE FOAMS

 Number/Link:US2015/0166756

Applicant/Assignee: Peterson Chemical Technology

Publication date: 18-06-2015

“Gist”: Gelatinous styrenic block copolymers are incorporated in flexible foams to increase thermal conductivity.

Why it is interesting: High viscosity styrenic triblock copolymer resins (like SBS, SEBS, SIS etc), plasticized with mineral oils, are added to flexible foam-forming compositions. The heat of the foam-forming reaction is said to be sufficient to further polymerize the resins and melt the styrene-block such that the block copolymers get integrated into the polyurethane matrix. The resulting foams show increased load bearing and improved thermal conductivity. These systems could improve the thermal comfort properties of cushioning materials, especially those of viscoelastic foams.

Poly(styrene-butadiene-styrene) or SBS.

Poly(styrene-butadiene-styrene) or SBS.

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by Gerhard Bleys on June 19, 2015  •  Permalink
Posted in Flexible Foams
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on June 19, 2015

https://purpatents.com/2015/06/19/flexible-foams-with-improved-thermal-comfort/

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