Antacids for polymers
AssigneeW.R. Grace & Co.-Conn.
InventorsAmaia Montoya-Goni, John Kaarto, Michelle Ni Paine, Jose Manuel Rego, Feng Gu, Demetrius Michos, James Neil Pryor
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Abstract
The present invention provides polymer compositions having improved corrosivity, color stability and clarity. Also disclosed is a process of preparing the polymers. The process may comprise incorporating into the polymer an acid neutralizing amount of an amorphous aluminum silicate. The amorphous aluminum silicate may be present in the polymer in an amount such that the polymer composition having a Corrosivity Index of less than 6. A refractive index of the amorphous aluminum silicate may be the same or substantially the same as a refractive index of the polymer.
Claims25
A method of neutralizing an acid in a polymer, the method comprising contacting a polymer with an amount of an amorphous alkali metal/alkaline earth metal aluminum silicate, wherein the amount of the amorphous alkali metal/alkaline earth metal aluminum silicate in the polymer is in a range of from 0.005 wt % to 2.0 wt % of the polymer;
- and the amorphous alkali metal/alkaline earth metal aluminum silicate contains (1) at least an alkali metal selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, and mixtures thereof, and (2) at least an alkaline earth metal selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, radium and mixtures thereof.
A process of reducing corrosivity of a polymer containing acidic impurities, the process comprising:
- incorporating into the polymer an amount of an amorphous alkali metal/alkaline earth metal aluminum silicate to obtain a polymer composition having a Corrosivity Index of less than 6, wherein the amount of the amorphous alkali metal/alkaline earth metal aluminum silicate in the polymer is in a range of from 0.005 wt % to 2.0 wt % of the polymer;
- and the amorphous alkali metal/alkaline earth metal aluminum silicate contains (1) at least an alkali metal selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, and mixtures thereof, and (2) at least an alkaline earth metal selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, radium and mixtures thereof.
A polymer composition having reduced corrosivity comprising a polymer comprising acid impurities and an amount of amorphous sodium magnesium aluminum silicate, wherein the amount of the amorphous sodium magnesium aluminum silicate in the polymer is in a range of from 0.005 wt % to 2.0 wt % of the polymer.
Dependencies are inferred from the claim text.