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US 11,975,552 B2Granted
Methods for preparing compositions comprising carbon black
AssigneeLanda Labs (2012) Ltd.
InventorsBenzion Landa, Sagi Abramovich, Amir Lion, Amit Haviv
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Abstract
There are disclosed curable elastomeric compositions comprising at least one reactive curable silicone pre-polymer capable of forming a silicone elastomer upon curing thereof, and a plurality of hydrophilic carbon black particles dispersed therein, as well as their corresponding cured products. Such compositions, once cured, can be used for the preparation of numerous articles of wide industrial applicability.
Claims21
A curable composition comprising:
- a) at least one reactive curable silicone vinyl-functional pre-polymer capable of forming a silicone elastomer upon addition-curing thereof;
- and
- b) a plurality of hydrophilic carbon black particles, dispersed with a dispersant non-covalently within said reactive curable silicone pre-polymer, said dispersant having at least one carbon-black-affinic moiety, having affinity to a hydrophilic surface of the hydrophilic carbon black particles;
- wherein a concentration of the hydrophilic carbon black particles within the composition is at least 0.01%, by weight;
- the carbon black particles having at least one of the following structural properties:
- I) a volatile matter content of at least 1.5%, by weight of the carbon black particles;
- II) a pH of at most 5.0, as measured in a 4 wt. % dispersion of the hydrophilic carbon black particles in aqueous methanol;
- III) an oxygen content of at least 1.0% by weight of the carbon black particles;
- IV) an acid value of the carbon black particles of at least 0.05 mmol/g;
- V) a surface zeta potential of at most −15 mV, as measured at a pH of 12 and a concentration of 2 wt. % in distilled water;
- VI) at least one type of functional group selected from the group consisting of epoxy, hydroxy and carboxylic moieties;
- VII) an ID/IG ratio of at least 0.8, wherein ID and IG represent the peak intensity maxima of D-band and G-band, respectively, of undeconvoluted spectra, as determined by Raman spectroscopy;
- and
- VIII) an AUCD/AUCG ratio of at least 1.2, wherein AUCD and AUCG represent the area under the curve of D-band and G-band, respectively, of deconvoluted spectra, as determined by Raman spectroscopy;
- wherein said dispersant includes an amino-silicone dispersant;
- wherein said amino-silicone dispersant is a non-reactive amino-silicone oil;
- wherein said non-reactive amino-silicone oil is devoid of silanol and alkoxy groups;
- and wherein the weight-per-weight ratio between said hydrophilic carbon black particles and said dispersant is within a range of 0.4:1 to 2:1.
15 more elements
A curable composition comprising:
- a) at least one reactive curable silicone pre-polymer capable of forming a silicone elastomer upon curing thereof;
- and
- b) a plurality of hydrophilic carbon black particles, dispersed with a dispersant non-covalently within said reactive curable silicone pre-polymer, said dispersant having at least one carbon-black-affinic moiety, having affinity to a hydrophilic surface of the hydrophilic carbon black particles;
- wherein a concentration of the hydrophilic carbon black particles within the composition is at least 0.01%, by weight;
- the carbon black particles having at least one of the following structural properties:
- I) an ID/IG ratio of at least 0.8, wherein ID and IG represent the peak intensity maxima of D-band and G-band, respectively, of undeconvoluted spectra, as determined by Raman spectroscopy;
- and
- II) an AUCD/AUCG ratio of at least 1.2, wherein AUCD and AUCG represent the area under the curve of D-band and G-band, respectively, of deconvoluted spectra, as determined by Raman spectroscopy;
- wherein the weight-per-weight ratio between said hydrophilic carbon black particles and said dispersant is within a range of 0.4:1 to 2:1.
6 more elements
Dependencies are inferred from the claim text.