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SYLVACLEAR Polymers - Inorganic UV Filter Stabilization

IP.com Disclosure Number: IPCOM000215157D
Publication Date: 2012-Feb-21

Publishing Venue

The IP.com Prior Art Database

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SYLVACLEAR™ Polymers Inorganic UV Filter Stabilization

© Arizona Chemical Company, LLC, 2011

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SYLVACLEAR™ Polymers Inorganic UV Filter Stabilization

• Background
- Inorganic minerals are used as physical UVfilters in broad spectrum sunscreen

  formulations
- The effectiveness of their dispersion can affect both the manufacturing process and

  efficacy of a formulation
- The initial dispersion (particle size reduction) and stabilization (prevention of

flocculation or settling) are important factors in the process

• Objective
- To examine the effect of SYLVACLEAR™ polymers on the dispersion and

stabilization of inorganic UV filters

• Methodology
- Prepare dispersions of inorganic UV filter, emollient and SYLVACLEAR™ polymer


• Control used only UV filter and Oil


• Experimental used only UV filter, Oil and 1.5% SYLVACLEAR™ polymer


- Measure viscosity as an indicator of degree of dispersion
- Measure gloss as a positive indicator of degree of dispersion
- Examine dispersions by digital microscopy
- Examine the effect of SYLVACLEAR™ polymers on stability in full formulated

inorganic sun screen

© Arizona Chemical Company, LLC, 2011

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SYLVACLEAR™ Polymers Inorganic UV Filter Stabilization


• Materials


- Inorganic UV Filters (25% loading)

• Titanium Dioxide: Oil Dispersible Anatase BC 325, 0.40µ mean particle size (Brenntag Corporation)


• Zinc Oxide: USP-1, 0.12µ mean particle size (Hallstar Corporation)


- Emollient (73.5%)


• C12-15 Alkyl Benzoate FINSOLV® TN (Innospec)


- SYLVACLEARTM Polymer (1.5%)


• Sample preparation


- IKA lightening mixer while heating to polymer softening point (~85°C)
- Held at constant rpm for 5 min
- Homogenized with Silverson L5M (small particle stator), 5 min, 2500 rpm
- Cooled to room temperature
- Held 24 hours
- Gently stirred
- Made measurements

© Arizona Chemical Company, LLC, 2011

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SYLVACLEAR™ Polymers Inorganic UV Filter Stabilization


• Measurements


- Viscosity


• Brookfield Viscometer DV-II+ Pro


• RV spindle 3 at 20 rpm (1min)


- Gloss


• Byk Gardner Tri Gloss Meter 60° on Lenetta Card.


• Drawdown made with 25µ Byrd Applicator (n=3)

© Arizona Chemical Company, LLC, 2011

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Viscosity Results - ZnO

All SYLVACLEAR™ polymers produced low viscosity dispersions

© Arizona Chemical Company, LLC, 2011

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Gloss Results - ZnO

All SYLVACLEAR™ polymers produced higher gloss than control

© Arizona Chemical Company, LLC, 2011

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Viscosity...