All posts tagged NOP polyols

Polyols from Epoxies and Cardanol

Title: CARDANOL MODIFIED EPOXY POLYOL

Number/Link: WO2015/077944 WO2015/077945 WO2015/078178

Applicant/Assignee: Dow

Publication date: 4-06-2015

“Gist”: Polyols are prepared by reacting an epoxy resin with cashew nutshell liquid.

Why it is interesting: Cardanol is the main component of cashew nutshell liquid which is a by-product of cashew nut processing. It is a “surfactant-like” phenolic compound which, when reacted with a polyepoxide, will result in a polyol with sec-OH groups. When used in polyurethane formulations these polyols will (unsurprisingly) be slow-reacting, highly hydrophobic and show compatibilizing properties vs apolar compounds. Dow have therefore filed three patent applications on PU systems containing these polyols: one on slowly-reacting PU systems for filament winding, one on highly hydrophobic PU elastomers and one on asphalt-PU compositions.
These are interesting polyols but they could be hard to process in my opinion.

Cardanol is reacted with bisphenol-A diglycidylether resulting in a diol according to the invention

Polyester TPU with Reduced Blooming

Title: POLYURETHANE BASED ON RENEWABLE RAW MATERIALS

Number/Link: WO2015/000722

Applicant/Assignee: BASF

Publication date: 8-01-2015

“Gist”: Preparing TPU from polyester diols based on a blend of diacids reduces blooming

Why it is interesting: This application relates to polyester polyols prepared from a diol and a mixture of diacids of which “at least one is at least partly” produced from a renewable resource. When these polyester diols are reacted with a diisocyanate and a chain extender, the resulting TPU shows a reduced tendency to “bloom” (i.e. form a white exudate on the surface). In the examples TPUs based on polyester polyols prepared from 1,3-propanediol and either azaleic- or sebacid acid (all from renewable resources) show very strong blooming while a TPU based on a polyester polyol prepared from 1,3-propanediol and a 1:1 blend of azeleic- and sebacic acid shows very little blooming. While this an interesting effect, it is not clear to me why “at least one of the diacids needs to be at least partly” made from a renewable resource is claimed. The claim appears unrelated to the actual invention.

Sebacic Acid

Flexible Foams from Inverse NOP Prepolymers

Title: Polyurethane Foam

Number/Link:US2014329923

Applicant/Assignee: Green Urethanes

Publication date: 06-11-2014 (priority PCT)

“Gist”: Flexible polyurethane foams based on OH-ended natural-oil polyol prepolymers

Why it is interesting: Polyols based on natural oils (NOPs) such as rapeseed-, soy-, castor oil and the like are hydrophobic, have sterically hindered hydroxyl groups and are therefore not compatible with conventionally used polyols and isocyanates. The amount of natural oil-based polyols that can be used is therefore limited to less than about 30% for conventional flexible slabstock and even less (5-10%) for HR foams. According to the current invention, prepolymerizing the NOP with a multifunctional isocyanate to form an OH-ended (‘inverse’) prepolymer, improves compatibility and reactivity and even reduces or eliminates the typical smell associated with these compounds. In the examples about 10% of the OH groups of different types of NOPs are pre-reacted with polymeric MDI using a gelling catalyst. The prepolymers are then foamed using TDI, water and conventional polyols. Flexible foams are produced containing 50-75% NOP on the total amount of polyol used.

Typical castor oil component

Innovation in Polyurethanes

All posts tagged NOP polyols

Polyols from Epoxies and Cardanol

Polyester TPU with Reduced Blooming

Flexible Foams from Inverse NOP Prepolymers

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