PCM Containing PU Gels

Title: Temperature Regulating Polyurethane Gels

Number/Link: US2017/0210961

Applicant/Assignee: Technogel

Publication Date: 27 july 2017

“Gist”: Fatty acid ester PCMs are incorporated into Technogel-type gels without encapsulation

Why it is interesting: Polyurethane gels have been discussed before in this blog. The current invention is about “Technogel-type”  gels, made at low NCO-index and high functionality, that contain phase change materials (PCMs). The PCMs are esters of fatty acids that can be blended in molten state with the low EO polyol to form a clear solution, which is then reacted with isocyanate to form the gel. Despite not being encapsulated or forming a separate phase, the PCMs can reversibly melt and crsytallize while in the fluid phase of the gel. In the examples blends of lauryl laurate (C12-C12) and myristyl myristate (C14-C14) are used as PCM such that the phase change temperature is about 22-38°C.  The gels are said to be useful for ‘close to body’ comfort applications especially for use in matresses to improve sleeping comfort.

Lauryl laurate

 

Flexible Foams containing Polyurethane Phase Change Gels

Title: Polyurethane Gel-Like Polymers, Methods and Use in Flexible Foams  

 Number/Link: US2013/0296449

Applicant/Assignee: PETERSON CHEMICAL TECHNOLOGY

Publication date: 07-11-2013

Gist”:   “Polyurethane phase change gels” prepared from polyurethane gels and conventional PCMs are incorporated into polyurethane or latex flexible foams to improve thermal comfort.

Why it is interesting: This application is closely related to the application discussed in the previous post but instead of a plasticized styrenic triblock copolymer, now a polyurethane gel is used. The PU gel is produced from conventional raw materials at low NCO-index (about 60%) together with plasticizers.

A Polyurethane Gel

A Polyurethane Gel

Incorporating “Phase Change Gels” into Flexible Foams for Improved Thermal Comfort

Title: Thermal Storage Gelatinous Triblock Copolymer Elastomer Particles in Polyurethane Flexible Foams

 Number/Link: US2013/295371

Applicant/Assignee: PETERSON CHEMICAL TECHNOLOGY

Publication date: 07-11-2013

Gist”:  Particles of  “phase change gels” prepared from plasticized styrenic TPEs and conventional PCMs are incorporated into polyurethane or latex flexible foams

Why it is interesting: A conventional phase change material (PCM) selected from alkanes, PEGs, hydrated salts ect. with a transition temperature between 20 and 35°C is melt-blended with a plasticized styrenic triblock copolymer like SBS, SIS, SEBS etc. to form a “phase change gel”. The gel is then comminuted and added to a flexible foam forming composition in an amount of about 30 pphp. The resulting foams have an increased thermal conductivity which together with the temperature buffering properties of the PCM improves thermal comfort. The flexible foams are useful in application such as matresses, pillows, automotive cushioning, shoe inserts, medical foams and the like. In my opinion especially useful for viscoleastic (“memory”) foams which are known to suffer from thermal discomfort problems.

Effect of "gel PCM" on heating rate of flexible foam according to the invention.

Effect of “gel PCM” on heating rate of flexible foam according to the invention.