US 11,708,478 B2
Use of mono-substituted succinic anhydride
Samuel Rentsch, Spiegel bei Bern (CH); Matthias Welker, Hésingue (FR); Christopher Pichler, Sierre (CH); Martin Brunner, Wallbach (CH); Michael Knerr, Oftringen (CH); and Tazio Fornera, Zofingen (CH)
Assigned to OMYA INTERNATIONAL AG, Oftringen (CH)
Appl. No. 16/305,499
Filed by Omya International AG, Oftringen (CH)
PCT Filed Jul. 13, 2017, PCT No. PCT/EP2017/067674
§ 371(c)(1), (2) Date Nov. 29, 2018,
PCT Pub. No. WO2018/015262, PCT Pub. Date Jan. 25, 2018.
Claims priority of application No. 16180243 (EP), filed on Jul. 19, 2016.
Prior Publication US 2020/0325302 A1, Oct. 15, 2020
Int. Cl. C08K 5/1539 (2006.01); C08K 3/26 (2006.01); C08K 9/04 (2006.01); C08L 67/04 (2006.01); C09C 1/02 (2006.01)
CPC C08K 5/1539 (2013.01) [C08K 3/26 (2013.01); C08K 9/04 (2013.01); C08L 67/04 (2013.01); C09C 1/021 (2013.01); C08K 2003/265 (2013.01)] 19 Claims
 
15. A method for reducing the polymer decomposition during processing and/or decreasing the melt flow rate of a polymer composition comprising (a) a polymer component comprising at least one polylactic acid, (b) at least one mono-substituted succinic anhydride and/or salty reaction product(s) thereof, and (c) at least one calcium carbonate-comprising material, by at least 20%, measured according to DIN EN ISO 1133-1:2011 (procedure A, 2.16 kg, 210° C., granules), in comparison to the same polymer composition that has been treated the same way without the at least one mono-substituted succinic anhydride and/or salty reaction product(s) thereof, the method comprising
a) providing a polymer component comprising at least one polylactic acid,
b) providing at least one calcium carbonate-comprising filler material,
c) providing at least one mono-substituted succinic anhydride and/or salty reaction product(s) thereof,
d) contacting the components of a), b) and c), and
e) compounding the contacted components of step d);
wherein in contacting step d) firstly the at least one calcium carbonate-comprising material of step b) is contacted under mixing, in one or more steps, with the at least one mono-substituted succinic anhydride and/or salty reaction product(s) thereof of step c) such that a treatment layer comprising the at least one mono-substituted succinic anhydride and/or salty reaction product(s) thereof is formed on the surface of said at least one calcium carbonate-comprising material of step b) in an amount of at least 0.1 wt.-%, based on the total dry weight of the at least one calcium carbonate-comprising filler material, and secondly this surface-treated calcium carbonate-comprising filler material is contacted under mixing, in one or more steps, with the polymer component,
wherein the calcium carbonate comprising material is present in the polymer composition in an amount from 5 to 40 wt.-%, based on the total weight of the polymer component,
wherein the calcium carbonate-comprising material has
i) a weight median particle size d50 value in the range from 0.1 μm to 10 μm and/or
ii) a top cut (d98) of 15 μm and/or
iii) a specific surface area (BET) of from 0.5 to 150 m2/g as measured using nitrogen and the BET method according to ISO 9277:2010 and/or
iv) a residual total moisture content of from 0.01 wt.-% to 1 wt.-%, based on the total dry weight of the at least one calcium carbonate-comprising material,
wherein the ratio of the polylactic acid to optionally present further polymer components present in the polymer composition is from 99:1 to 20:80, based on the weight of the polymer components, and
wherein the at least one mono-substituted succinic anhydride and/or salty reaction product(s) thereof comprises at least one alkenyl mono-substituted succinic anhydride and/or salty reaction product(s) thereof.