HeteroCage-POSS®

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Description

HOMOLEPTIC VS HETEROLEPTIC POSS® ADDITIVES

Heterolepetic cages (HC) are the third generation of POSS® additives.  They are advantageous because they 

provide a statistically random distribution of two or more organic groups around the cage core. Especially unique 

to heteroleptics, is their ability to incorporate disparate organic functionalities together on the same cage.  

This new versatility allows HC POSS  additive to serve as compatibilizers in addition to providing an envelope of 

effects.  The example shown below illustrates the combination of glycidyl and methacryl groups onto a heteroleptic 

cage. *Multiple primary reactive groups, can be combined with multiple secondary “effect” groups on heterocages.

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All HC POSS® still retain the cage structure that enables them to be formulated in the same manner as 

organic-additives into thermoset, elastomer, and thermoplastic formulations.  The cage core size in HC POSS 

is a distribution of eight, ten and twelve which renders most HC POSS to be liquids as opposed to solids. 

The distribution of organic groups follows mathematical combinatorics.

ADVANTAGES:  Ideal for coatings that can benefit from primary reactivity  and  secondary effects (dispersion, gloss, 

leveling, compatibilization etc.). HC POSS eliminate the need for use of multiple additives thus simplifying 

formulations.

APPLICATIONS: Adhesives coatings, dispersion and reactive rheological diluents . 

Tie-layers, dual-uv cure (cationic + free radical) replacing oven processing, toughening at low loadings.

The suggested loading levels for HC POSS are 0.5-3 wt% relative to resin.

Primary Reactivity “R” group  /Name /Effect

Methacryloxypropyl   

Fast UV, thermal, addition cure, vulcanization, rheological diluency, adhesion/reaction to coupling agents

Acryloxypropyl

Faster UV, thermal, addition cure, vulcanization, rheological diluency, adhesion/reaction to coupling agents

Alpha Acryloxy

Fastest UV, thermal, addition cure, vulcanization, adhesion to coupling agents

Glycidyl

Cationic UV, thermal cure adhesion, coupling agent adhesion, modest dispersion

Cyclohexylethylepoxy

Cationic UV, thermal cure, coupling agent adhesion, overall adhesion promoter

Ethylnorbornene

ROMP, thermal cure, vulcanization, toughener for hydrosilylation cures relative to the vinyl functionality

Vinyl

ADMET, thermal  cure, vulcanization, hydrosilylation cure

Secondary Effect “R” group  Name/Effect

MethoxyPEG10

Wetting, dispersion, levelling, adhesion, gloss, water dispersion, bio-issue compatibilization

Phenyl

Compatibilization with aromatics, high temp stability.

Iso-octyl

Gloss, hydrophobicity, aliphatic compatibilization, rheological diluent, plasticization

Iso-butyl

Hydrophobicity, aliphatic compatibilization, modest reinforcement, modest plasticization

Trifluoropropyl

Similar to i-butyl, compatibilization of fluorinated additives.

Methyl

Low carbon efficiency.

Links to current heterocage offerings are provided below.

HC0304.11 Cyclohexylepoxy Glycidyl POSS

HC0310.31 – Cyclohexylethylepoxy isoOctyl POSS

HC0313.31 – Cyclohexylethylepoxy PEG POSS

HC0407.11 – Glycidyl Methacryl POSS

HC0407.13 – Glycidyl Methacryl POSS

HC0407.31 – Glycidyl Methacryl POSS

HC040713.332 Glycidyl Methacryl PEG POSS

HC0413.53 – Glycidyl PEG POSS

HC0507.53 – Trifluoropropyl Methacrylate POSS

HC0613.53 – Acrylic PEG

HC07051013.2211 Methacrylpropyl Trifluoropropyl iso-Octyl PEG POSS

HC0709.13 Methacrylpropyl iso-butyl POSS

HC0710.13 – Methacryloxypropyl isoOctyl POSS

HC0713.31 – Methacryloxypropyl PEG POSS

HC1110.71 Vinyl iso-Octyl POSS