Novel i-PEEP Polymers

Patent Title:  ISOCYANATE-MODIFIED POLYESTER-EPOXIDE POLYMER COMPOSITIONS

 Number/Link: WO2018/160217

Applicant/Assignee:  Stepan

Publication date: 7 September 2018

“Gist”: Polyester polyols are reacted with isocyanates and polyepoxies

Why it is interesting: The invention is related to isocyanate-modified polyester-epoxy polymers (i-PEEPs) which are said to be a “new class of polymers” useful as adhesives, coatings and elastomers.  The materials are prepared by reacting polyester polyols with both polyisocyanates and polyepoxies at an “i-PEEP index” (=(eqvs iso + eqvs epoxy)/eqvs polyol in %) of 100 to 200. The reaction can be run catalysed at room temperature or optionally un-catalyzed at 40 to 100°C. In the examples aromatic and aliphatic polyester polyols are reacted with polymeric MDI and BPA-DGE – based polyepoxide at different indices to produce elastomers with shore A hardness ranging between 30 and 95.
Interesting materials, although calling them a new class of polymers may be a bit exaggerated.

Bisphenol_A_diglycidyl_ether_200

Bisphenol-A diglycidylether (BPA-DGE)

 

Polyurethane Oil Gel

Patent Title: OIL GEL, PRESSURE RESISTANT MATERIAL USING SAME FOR PROTECTING ELECTRONIC DEVICES AND OIL GEL-FORMING AGENT

 Number/Link: WO2018135494  (Japanese)

Applicant/Assignee:  Sec Corp.

Publication date: 26 July 2018

Gist”: A gel from a paraffinic  oil and a compatible linear PU is used as a pressure resistant material for deep-sea applications

Why it is interesting: The invention relates to a PU-oil gel that is used as a kind of “potting compound” to protect subsea electronics at “abyssal depths” , i.e. at pressures of 5.6 MPa (about 550m deep). The gel is prepared by reacting a hydrophobic diol and a hydrophobic diisocyanate in the presence of 10-50% (w/w) on the total composition of a paraffinic oil. In the examples an OH-ended, saturated polyisoprene is used as diol together with norbornanediisocyanate.

NBDI

2,5-norbornane diisocyanate

PU Elastomers from SGO Polymerized Acrylic Polyols

Patent Title: PHYSICAL PROPERTY IMPROVEMENT OF POLYURETHANES

 Number/Link: WO2018/132648

Applicant/Assignee:  BASF

Publication date: 19 July 2018

Gist”: Solvent-free acrylate polyols are reacted together with polyether polyols and diisocyanates

Why it is interesting: In this invention a solvent-free (“100% solids” in the patent’s terminology) acrylic polyol is blended with a conventional polyether polyol and reacted with an aliphatic or aromatic diisocyanate.  The acrylic polyol is prepared by co-polymerizing (e.g.)  ethyl- or butyl (meth)acrylates, styrene and a hydroxyl functional acrylate like 2-hydroxyethyl acrylate or 4-hydroxybutyl acrylate, using BASF’s “solid grade oligomer” (SGO) polymerization process. The SGO process is a high temperature and high pressure continuous process allowing for the production of low-solvent acrylic resins. The polyurethanes are said to have increased physical properties, esp. tear- and tensile strength properties.

HBA

Hydroxybutylacrylate

Phosgene-Free Polyisocyanate with PDMS Backbone

Patent Title: MULTI-FUNCTIONAL CARBAMATE HAVING SOFT-SEGMENTS, POLYISOCYANATE OBTAINED VIA SUBSEQUENT NON-PHOSGENE SYNTHESIS METHODS, URETHANE PREPOLYMER AND ELASTOMERIC URETHANE HAVING SOFT-SEGMENTS DERIVED THEREFROM, AND PREPARATION METHOD THEREOF

 Number/Link: US20180186918

Applicant/Assignee:  Great Eastern Resins Industrial

Publication date: 5 July 2018

Gist”: Biscarbamate with PDMS softblock backbone is heat-cracked into diisocyanates

Why it is interesting: The invention relates to isocyanate-capped “softblock” siloxanyl prepared without using phosgene and polyurethanes derived therefrom. The invention is accomplished by reacting relatively high MW polydimethylsiloxanediamines with diphenylcarbonate.  The resulting biscarbamate is heated under reduced pressure to produce the diisocyanate and to remove the phenol by-product.  The isocyanates can be reacted with polyols and/or chain extenders to produce highly hydrophobic polyurethanes with low surface tension and good chemical resistance.

biscarbamate

Biscarbamate with PDMS backbone

 

Catalyst System for Frothed Foams

Patent Title: METHOD FOR DELAYING CURING IN POLYURETHANE AND COMPOSITIONS AND ARTICLES MADE THEREFROM

 Number/Link: WO2018/075302

Applicant/Assignee:  Rogers

Publication date: 26-April-2018

Gist”: A mixture of  a metal acetylacetonate and a catalytic inhibitor prevents premature curing

Why it is interesting:  A catalyst system that prevents premature curing of frothed (PORON® – type) foams consists of  ferric acetylacetonate catalyst and a β-diketone inhibitor e.g. acetylacetone or dibenzoyl methane. The catalyst combination allows for handling of the raw materials at 55°C for 5 minutes without reacting.  Frothed foams tend to have improved properties, like compression set as compared to conventional foams.

Tris(acetylacetonato)iron(III)

Tris(acetylacetonato)iron(III)  (Wikipedia)