Source: http://www.google.com/patents/US6758895?ie=ISO-8859-1
Timestamp: 2014-09-23 17:43:03
Document Index: 762795833

Matched Legal Cases: ['Application No. 09', 'Application No. 09', 'Application No. 09', 'Application No. 09', 'Application No. 10', 'Application No. 10', 'Application No. 10']

Patent US6758895 - Hydrous mineral suitable for use as an opacifying pigment, filler or extender - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA particulate hydrous mineral suitable for use as an opacifying pigment, filler or extender has a shape factor which is greater than S, where S is defined by Equation 1 as follows: S=(d 50/0.036)+20 Equation 1; where d50 is the mean particle size of the particles of the mineral measured in microns. The...http://www.google.com/patents/US6758895?utm_source=gb-gplus-sharePatent US6758895 - Hydrous mineral suitable for use as an opacifying pigment, filler or extenderAdvanced Patent SearchPublication numberUS6758895 B2Publication typeGrantApplication numberUS 09/930,994Publication dateJul 6, 2004Filing dateAug 17, 2001Priority dateAug 17, 2000Fee statusPaidAlso published asEP1313811A1, EP1313811B1, EP1914275A1, US20020117085, WO2002016510A1Publication number09930994, 930994, US 6758895 B2, US 6758895B2, US-B2-6758895, US6758895 B2, US6758895B2InventorsRobin WesleyOriginal AssigneeImerys Minerals LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (102), Non-Patent Citations (18), Referenced by (5), Classifications (15), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetHydrous mineral suitable for use as an opacifying pigment, filler or extenderUS 6758895 B2Abstract A particulate hydrous mineral suitable for use as an opacifying pigment, filler or extender has a shape factor which is greater than S, where S is defined by Equation 1 as follows:
S=(d 50/0.036)+20 Equation 1; where d50 is the mean particle size of the particles of the mineral measured in microns. The particulate mineral is preferably a kaolin, which is particularly suitable for use in aqueous matt paint compositions.
S=(d 50/0.036)+20 Equation 1; where d50 is the mean particle size of the particles of the mineral measured in microns (micrometers).
S=(d 50/0.036)+25 Equation 2. The hydrous mineral according to the invention may be prepared by light comminution, e.g. grinding or milling, of a coarse mineral to give suitable delamination thereof. The comminution may be carried out by use of beads or granules of a plastics, eg. nylon, grinding or milling aid. The coarse mineral may be refined to remove impurities and improve physical properties using well known procedures. The mineral may be treated by a known particle size classification procedure, e.g. screening and/or centrifuging, to obtain particles having a desired particle size distribution and d50 value.
(Rs/Ru)�100 where Rs is the mean reflectance of the treated stained paint film and Ru is the mean reflectance of the unstained paint film. The result is expressed as a percentage value.
EXAMPLE 1 A hydrous kaolin embodying the invention, Kaolin 1, was obtained from Cornwall, U.K. It had been refined by standard processing procedures and was lightly ground. Kaolin 1 had a d50 value of about 1.32. According to Equation 1 earlier, the shape factor for this product should be greater than (1.32/0.036)+20, i.e. greater than about 57. The shape factor was in fact measured as 94.
EXAMPLE 2 A fine hydrous kaolin embodying the invention, Kaolin 2, was obtained from an Indonesian deposit. It was processed by known procedures. Kaolin 2 had a d50 value of about 0.61 μm. According to Equation 1 this required the shape factor to be greater than (0.61/0.036)+20, i.e. greater than about 37. The shape factor of Kaolin 2 was in fact measured as 76.
EXAMPLE 3 A further hydrous kaolin embodying the invention, Kaolin 3, was obtained from Brazil. Kaolin 3 had been refined and lightly ground. Kaolin 3 had a d50 value of about 2.4 μm. According to Equation 1 earlier, the shape factor should be greater than (2.4/0.036)+20, i.e. greater than about 87. The shape factor of Kaolin 3 was in fact measured to be 140.
EXAMPLE 4 A further hydrous kaolin embodying the invention, Kaolin 4, was obtained having a d50 value of 0.56 μm. According to Equation 1 this requires the shape factor to be greater than (0.56/0.036)+20, i.e. greater than about 35. The shape factor was in fact measured as 69. The oil absorption of Kaolin 4 was measured by Method A to be about 69 grammes of linseed oil per 100 grammes of kaolin. The BET surface area of Kaolin 4 was found to be 17.97 m2g−1. The Steepness of Kaolin 4 was found to be 31.
EXAMPLE 5 (COMPARATIVE) A commercially available hydrous kaolin, Kaolin 5, from Cornwall, UK sold as an opacifying extender in matt paint compositions was obtained. Kaolin 5 was found to have a d50 value of about 0.47 μm. For a kaolin to satisfy Equation 1 with this d50 value it would have to have a shape factor greater than (0.47/0.036)+20, i.e. greater than about 33. However, Kaolin 5 was found to have a shape factor of about 21. It was also found using Method A to show an oil absorption of about 40 grammes of Kaolin per 100 grammes of kaolin. The BET surface area of Kaolin 5 was found to be 14.6 m2g−1.
EXAMPLES 6, 7, 8, 9 AND 10 Hydrous kaolins embodying the invention, Kaolins 6, 7, 8, 9 and 10 were obtained from Cornwall, England. The kaolins had been refined by standard processing techniques and were lightly ground. The physical properties of Kaolins 6, 7, 8, 9 and 10 are set forth in Table 2, as follows:
EXAMPLES 11 AND 12 Hydrous kaolins embodying the invention, Kaolins 11 and 12 were obtained from a US deposit. The kaolins were refined by standard processing techniques and were lightly ground. The physical properties of Kaolins 11 and 12 are set forth in Table 4, as follows:
EXAMPLE 13 A hydrous kaolin embodying the invention, Kaolin 13, was obtained from an Australian deposit. It had been refined by standard processing procedures and was lightly ground. Kaolin 13 had a d50 value of about 0.45. According to Equation 1 earlier, the shape factor for this product should be greater than (0.45/0.036)+20, i.e. greater than about 32.5. The shape factor was in fact measured as 72.5.
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De C.V.Structured mineral multi-pigment* Cited by examinerClassifications U.S. Classification106/486, 106/428, 106/416International ClassificationC09C1/42Cooperative ClassificationC01P2006/12, C01P2004/62, C01P2004/61, C01P2006/19, C01P2004/20, C09C1/42, C01P2004/54, C01P2004/51, C01P2006/60, C01P2004/32European ClassificationC09C1/42Legal EventsDateCodeEventDescriptionJan 6, 2012FPAYFee paymentYear of fee payment: 8Dec 11, 2007FPAYFee paymentYear of fee payment: 4Aug 24, 2004CCCertificate of correctionAug 17, 2001ASAssignmentOwner name: IMERYS MINERALS, LTD., GREAT BRITAINFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WESLEY, ROBIN;REEL/FRAME:012098/0281Effective date: 20010622Owner name: IMERYS MINERALS, LTD. JOHN KEAY HOUSE, ST. AUSTELLFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WESLEY, ROBIN /AR;REEL/FRAME:012098/0281RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google