Tack-Free Polyurethane Gels

Title: SUPPORT STRUCTURES INCLUDING LOW TACK VISCOELASTOMERIC GEL MATERIAL AND METHODS

 Number/Link: US20130011621

Applicant/Assignee: Polymer Concepts Inc.

Publication date: 10-01-2013

Gist”: Tack-free “non-bleeding” polyurethane gels by plasticizing a low-hardblock PU system with oils.

Why it is interesting: Polyurethane gels are often produced from low NCO-index systems, or other systems comprising ‘loose’ chains causing tackiness. Alternatively plasticizers can be used which can exude or ‘bleed’ especially at elevated temperatures.  This case claims a tack-free and non-bleeding gel.  In the example a low hardblock, index 98 system is plasticized by a combination of soy oil and epoxidized soy-oil, together with some 500cS silicon oil. Instead of natural oils a combination with hydrocarbon oil is claimed as well.   If true, this would be an interesting system, but it is hard to believe that the oils will not bleed over time. Especially the hydrocarbons.

Excercise Ball from Tack-Free PU gel

Excercise Ball from Tack-Free PU gel

Flexible Polyurethane Foams containing Gel Particles: an Alternative to “Memory Foams”?

Title: COMPOSITE MATERIAL FOR MAKING ARTICLES OUT OF POLYURETHANE DOPED WITH POLYMERIC GEL AND THE PROCEDURE FOR MAKING IT

 Number/Link: WO2012160515

Applicant/Assignee: NEW WIND S.R.L.

Publication date: 29-11-2012

Gist”: Viscoelastic foams produced by dispersing (silicon?) gel particles into the polyol stream.

Why it is interesting: Viscoelastic or “memory foams” are popular in the bedding industry. This case claims to improve upon the current technology by incorporating into the foam matrix 5 to 20% of ‘gel particles’ with a size of 1 to 5mm.  Advantages over curent memory foams mentioned are a lower glass transition temperature and a cool or “fresh” feel to the touch.  The ‘polymeric gels’ are however ill defined in the text and according to claim 6 “said silicone gel is a SEBS rubber”(?).  While being an interesting idea the case has little chance of being granted according to the examiners report. MemoryFoam

  • Pages

  • Categories

  • Enter your email address to follow this blog and receive notifications of new posts by email.

    Join 1,090 other followers

  • Follow Innovation in PU on Twitter

%d bloggers like this: