All posts tagged bio-based materials

Polyurethane for Filament Winding

Patent Title: FILAMENT WINDING PROCESSES USING POLYURETHANE RESINS AND SYSTEMS FOR MAKING COMPOSITES

 Number/Link: W2016183073

Applicant/Assignee: Covestro

Publication date: 17-11-2016

“Gist”: Compositions comprising polymeric MDI, amine-initated polyethers and natural oil polyols are useful for filament winding

Why it is interesting: Filament winding is a process for the production of hollow composite structures whereby resin-impregnated fibers are wound on a mandrel and then cured. Typically the fibers are impregnated with polyesters or epoxies.  Polyurethane compositions are difficult to use in this process because of reactivity and moisture sensitivity. According to this invention an isocyanate reactive composition comprising at least 50% high functionality amine-initiated polyether polyols and up to 50% of a hydrophobic OH-functional vegetable oil, can be advantageously used for PU filament winding. In the examples blends of 3 and 4-functional amine-initated polyether polyols with mole weight of about 250, castor oil, or OH-functional soy-oil, are used together with a high 2,4′ polymeric MDI.

Filanent winding process

Filanent winding process

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by Gerhard Bleys on November 18, 2016  •  Permalink
Posted in composites, Polyols
Tagged , , , , , , , ,

Posted by Gerhard Bleys on November 18, 2016

https://purpatents.com/2016/11/18/polyurethane-for-filament-winding/

Non-Isocyanate Polyurethanes from Sucrose-Fatty Acid Esters

Patent Title: BIOBASED CYCLIC CARBONATE FUNCTIONAL RESINS AND POLYURETHANE THERMOSETS THEREFROM

 Number/Link: US2016/0312060

Applicant/Assignee: NDSU

Publication date: 27-10-2016

“Gist”: Epoxidized sucrose-fatty acid esters are reacted with CO2, then with polyamines

Why it is interesting:  Esters of unsaturated fatty acids and sucrose have been known since the 1960s and are useful in e.g. coatings.  Highly subsituted sucrose esters with an average of 7.7 fatty acid chains per molecule, a molecular weight of about 2400 and a relatively low viscosity of 300-400 mPa.s are commercially available. According to this invention, epoxidized sucrose-fatty acid esters can be further reacted with carbon dioxide resulting in a resin with a ‘pluraility’ of cyclocarbonate groups. Curing with polyamines results in highly crosslinked poly(hydroxyurethanes) useful for coatings, composites and adhesives.

Epoxidized sucrose-fatty acid ester

Epoxidized sucrose-fatty acid ester

 

 

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by Gerhard Bleys on October 31, 2016  •  Permalink
Posted in Adhesives-Coatings, composites
Tagged , , , , , , , , , , ,

Posted by Gerhard Bleys on October 31, 2016

https://purpatents.com/2016/10/31/non-isocyanate-polyurethanes-from-sucrose-fatty-acid-esters/

Green Tea Memory Foam

Patent Title: Foam with Green Tea Additive for Foam Mattresses, Pillows and Cushions

 Number/Link: US2016/0270549

Applicant/Assignee: Zinus

Publication date: 22-09-2016

“Gist”: Green Tea is added to memory foam formulation

Why it is interesting: Powdered leaves of the Green Tea plant (Camellia sinensis) are added to memory foam formulations in an amount of less than 2% (w/w) on the total composition.  The Green Tea is said to kill bacteria, mites and molds and reduce the smell of the foam when used in pillows and mattresses for example. Since tea leaves are also claimed to “brighten eyesight, refresh the brain and resist radiation” it’s hard to know if the claim is true. If it doesn’t work it won’t hurt I guess.

Cammelia sinensis (Wikipedia)

Camellia sinensis (Wikipedia)

 

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by Gerhard Bleys on September 26, 2016  •  Permalink
Posted in Flexible Foams
Tagged , , , , , , ,

Posted by Gerhard Bleys on September 26, 2016

https://purpatents.com/2016/09/26/green-tea-memory-foam/

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