Amino ester that imparts optical properties when added to paper

Details Amino ester that imparts optical properties when added to paper Amino ester that imparts optical properties when added to paper

2000-06-12

2002-07-16

Chin, Peter (Department: 1731)

Paper making and fiber liberation

Processes and products

Non-fiber additive

C162S179000, C106S243000, C106S287240, C106S287250, C106S287260

Reexamination Certificate

active

06419791

ABSTRACT:

BACKGROUND OF THE INVENTION
In the paper making industry, opacity, brightness and strength of the paper are desirable traits which are often balanced against each other. Opacity, the degree which the paper transmits light is particularly desirable for many applications; papers with a low opacity are difficult to read when images are printed on both sides. Many conventional opacifiers add excessive bulk to the paper thereby increasing the weight and the thickness of the paper.
It would be desirable to have a bright, opaque paper which is not excessively bulky and does not suffer a decrease in strength.
SUMMARY OF THE INVENTION
The present invention provides a novel method of opacifying paper, and a novel opacifier and opacifying composition which opacify as well as brighten paper. The novel opacifier comprises a mixture of at least one diglyceride and at least one amino-ester compound. Preferably the opacifier comprises from 17% to 72%, more preferably from 31% to 63%, most preferably from 45% to 55% diglyceride and preferably from 28% to 83%, more preferably from 37% to 59%, most preferably from 45% to 55% of the amino-ester compound.
The opacifying composition comprises: preferably from 0.1% to 100%, more preferably from 0.1% to 35%, even more preferably from 1% to 25%, most preferably from 7% to 15% of solids and preferably from 0 to 99.9999%, more preferably from 0.0001% to 99.9999%, even more preferably from 65% to 99.9%, even more preferably from 99% to 75%, most preferably from 85% to 93% of liquid, preferably water.
The solids comprise opacifier and surfactant. Preferably the solids comprise from 50 to 100%, more preferably from 80% to 99.9999%, even more preferably from 95% to 99.9998%, most preferably from 97% to 99.9%, opacifier; and preferably from 0% to 50% more preferably from 0.0001% to 50%, even more preferably from 0.0001% to 20%, even more preferably from 0.0022% to 5%, most preferably from 0.1% to 3%, surfactant. Preferably, the opacifying composition is an emulsion of the solids in water.
The inventions also relate to paper, methods of enhancing optical properties of paper and to methods of making the novel opacifying compositions.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a novel method of opacifying paper, and a novel opacifier and opacifying composition which opacify as well as brighten paper. The novel opacifier comprises a mixture of at least one diglyceride and at least one amino-ester compound. Preferably the opacifier comprises from 17% to 72%, more preferably from 31% to 63%, most preferably from 45% to 55% diglyceride and preferably from 28% to 83%, more preferably from 37% to 59%, most preferably from 45% to 55% of the amino-ester compound. The opacifying composition comprises the opacifier and preferably water.
The opacifying composition comprises: preferably from 0.1% to 100%, more preferably from 0.1% to 35%, even more preferably from 1% to 25%, most preferably from 7% to 15% of solids; and preferably from 0 to 99.9%, more preferably from 0.0001% to 99.9999%, even more preferably from 65% to 99.9%, even more preferably from 99% to 75%, most preferably from 85% to 93% of liquid, preferably water.
The solids comprise opacifier and surfactant. Preferably the solids comprise from 50% to 100%, more preferably from 80% to 99.9999%, even more preferably from 95% to 99.9998%, most preferably from 97% to 99.9%, opacifier; and preferably from 0% to 50%, more preferably from 0.0001% to 50%, even more preferably from 0.0001% to 20%, even more preferably from 0.0022% to 5%, most preferably from 0.1% to 3%, surfactant. All percentages are by weight unless otherwise stated.
Preferably, the opacifying composition is an emulsion of the solids in water.
An acid is preferably present in an effective amount to provide the opacifying composition with a pH less than 6. The acid is preferably present in an effective amount to provide the opacifying composition with a pH of from 3 to 6, more preferably 4 to 5.
The Opacifier
The opacifier comprises a mixture of at least one diglyceride and at least one amino-ester compound. The diglyceride has the following structure:
wherein:
R
1
is an alkyl group, preferably having from 4 to 23 carbon atoms, more preferably from 8 to 20 carbon atoms, most preferably from 10 to 17 carbon atoms;
R
2
is an alkyl group, preferably having from 4 to 23, more preferably from 8 to 20 carbon atoms, most preferably from 10 to 17 carbon atoms;
wherein R
1
and R
2
are the same or different.
Preferably the diglyceride is a mixture having from 10% to 95%, more preferably from 51% to 90% diglyceride wherein R
1
and R
2
have 17 carbon atoms, and from 5% to 90%, more preferably from 10% to 49%, diglyceride wherein R
1
and R
2
have 15 carbon atoms.
Good results have been obtained using hydrogenated tallow, which has a mixture of diglycerides, comprising for example: 3.4% of a diglyceride where R
1
and R
2
have 13 carbon atoms; 28.9% of a diglyceride where R
1
and R
2
have 15 carbon atoms; 0.8% of a diglyceride where R
1
and R
2
have 16 carbon atoms; and 66.9% of a diglyceride where R
1
and R
2
have 17 carbon atoms.
Good results have also been obtained using soybean oil, which has a mixture of diglycerides comprising for example: 0.1% of a diglyceride where R
1
and R
2
have 13 carbon atoms and no double bond; 0.1% of a diglyceride where R
1
and R
2
have 13 carbon atoms and one double bond; 10.5% of a diglyceride where R
1
and R
2
have 15 carbon atoms and no double bond; 3.2% of a diglyceride where R
1
and R
2
have 17 carbon atoms and no double bond; 22.3% of a diglyceride where R
1
and R
2
have 17 carbon atoms and one double bond; 54.5% of a diglyceride where R
1
and R
2
have 17 carbon atoms and two double bonds; 8.3% of a diglyceride where R
1
and R
2
have 17 carbon atoms and three double bonds; 0.2% of diglyceride where R
1
and R
2
have 19 carbon atoms and no double bond; 0.9% of a diglyceride where R
1
and R
2
have 19 carbon atoms and one double bond.
The amino-ester compound has the following structure:
wherein:
R
4
is an alkyl group of from 4 to 23 carbon atoms, preferably from 10 to 17 carbon atoms;
R
5
is an alkyl alcohol group of from 1 to 15 carbon atoms, preferably from 1 to 6 carbon atoms;
R
6
is an alkyl group of from 1 to 15 carbon atoms, preferably from 1 to 6 carbon atoms, or an alkyl alcohol group of from 1 to 15 carbon atoms, preferably from 1 to 6 carbon atoms, or a hydrogen; and
R
7
is an alkyl group of from 1 to 15 carbon atoms, preferably from 1 to 6 carbon atoms, or an alkyl alcohol group of from 1 to 15 carbon atoms, preferably from 1 to 6 carbon atoms, or a hydrogen;
wherein R
5
, R
6
, and R
7
are the same or different.
Good results have been obtained wherein R
5
, R
6
, and R
7
have two carbon atoms and R
6
, and R
7
are alkyl alcohols.
Mixtures of diglycerides and mixtures of amino-ester compounds are also useful.
The Opacifying Composition
The opacifying composition comprises the opacifier, preferably a liquid the liquid preferably being water, preferably a surfactant, and preferably an acid. Preferably the surfactant is an ethylene oxide surfactant, preferably an ethoxylated tallow amine. Examples of other suitable surfactants are fatty acids ethoxylates, such as stearic acid with 20 moles of ethoxylate, fatty amine surfactants such as tallow amine with 15 moles ethoxylate, nonyl phenol ethoxylates, and fatty alcohol ethoxylates such as lauryl alcohol with 7 moles ethoxylate and stearyl alcohol with 24 moles of ethoxylate. Preferred acids are for example, acetic acid, propanoic acid, butanoic acid, pentanoic acid or methyl sulfate.
The salt is optionally added to reduce viscosity. Suitable salts are calcium chloride, sodium acetate and sodium bicarbonate. Preferably, the salt is present from 0.0022% to 1%, more preferably from 0.01% to 0.5%, most preferably from 0.1% to 0.3%.
Optionally, conventional antifoaming agents, bactericide, and fungicides are added to the opacifying composition or the opacifier or both.
Preparation of the Opacifying Composition

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