Claims
- 1. A paper size composition comprising an aqueous emulsion of:
- a) a cyclic dicarboxylic acid anhydride represented by the formula: ##STR8## wherein R represents a dimethylene or trimethylene radical and R' is a hydrophobic group containing 5 to 30 carbon atoms and which may be selected from the class consisting of alkyl, alkenyl, aralkyl, alkaryl, alkenaryl and aralkenyl groups;
- b) a cationic, non-degraded starch which is further modified to a DS of from about 0.005 to 0.4 with either:
- i) an ether group, R--O-- where R is an hydroxyalkyl or alkyl of 1 to 4 carbon atoms or alkenyl of 2 to 4 carbon atoms,
- ii) an ester group, ##STR9## where R is an alkyl of 1 to 4 carbon atoms, or alkenyl of 2 to 4 carbon-atoms,
- wherein the non-degraded, fully modified starch has a viscosity of at least 1,000 cPs at 30.degree. C. in an 8% aqueous solution, and
- c) water,
- and wherein there is from about 0.1 to 10 parts by weight of modified cationic starch per part of cyclic dicarboxylic acid anhydride.
- 2. The size composition of claim 1 wherein the starch is an amylose containing starch having at least 5% amylose content, the R in the ether group is an hydroxyalkyl of 2 to 3 carbon atoms and the R in the ester group is an alkyl of 1 to 2 carbon atoms.
- 3. The size composition of claim 2 wherein about 0.5 to 5 parts of modified cationic starch per part of substituted cyclic dicarboxylic acid anhydride is used, the starch is further modified to a DS of from about 0.02 to 0.085 and the fully modified starch has a viscosity of from 1,000 to 100,000 cPs at 30.degree. C. in an 8% aqueous solution.
- 4. The size composition of claim 3 wherein the starch is corn, potato or tapioca starch.
- 5. The size composition of claim 4 wherein the starch is cationized with a tertiary amino or quaternary ammonium ether group.
Parent Case Info
This application is a division of application Ser. No. 08/422,731, filed May 17, 1995 now U.S. Pat. No. 5,595,631.
US Referenced Citations (11)
Foreign Referenced Citations (1)
Number |
Date |
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0 014 520 |
Aug 1980 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
442731 |
May 1995 |
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