Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1993-10-26
2001-02-13
Sanders, Kriellion (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S193000, C524S291000
Reexamination Certificate
active
06187846
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention is related to the field of pigmented, stereoregular, branched-mono-1-olefin polymer compositions.
It is known in the art that polymer compositions usually need to be stabilized against a variety of degradation processes. These degradation processes can render a polymer composition almost entirely useless. For example, polymer compositions usually need to be stabilized against thermal degradation because such degradation can tear apart the polymer chains as well as discolor the polymer composition. Pigmented, stereoregular, branched-mono-1-olefin polymer compositions (hereafter pigmented “SBM” polymer compositions) are especially susceptible to thermal degradation due to, in part, the particular polymerization processes used to produce these polymers, the molecular structure of these polymers, and the pigments used in these polymers.
It is also known in the art that certain compounds can usually be added to a polymer composition to stabilize a polymer composition against certain degradation processes. However, it is also known that this area of polymer science is a highly unpredictable area.
SUMMARY OF THE INVENTION
This invention provides an additive composition that has a combination of compounds that can improve a pigmented SBM polymer composition's resistance to thermal degradation. Furthermore, this invention provides a pigmented SBM polymer composition that has a combination of compounds that improves a pigmented SBM polymer composition's resistance to thermal degradation.
It is an object of this invention to provide an additive composition that improves the thermal resistance of pigmented SBM polymer compositions.
It is another object of this invention to provide pigmented SBM polymer compositions that have improved resistance to thermal degradation.
It is another object of this invention to provide a pigmented polypropylene homopolymer or copolymer composition that has an improved resistance to thermal degradation.
In accordance with this invention an additive composition is provided that comprises (or optionally consists essentially of, or consists of):
(a) tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate;
(b) bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite; and
(c) a costabilizer selected from the group consisting of sodium stearoyl lactylate, calcium stearoyl lactylate, calcium lactate, and mixtures thereof.
In accordance with another embodiment of this invention polymer compositions are provided that comprise (or optionally consist essentially of, or consist of):
(a) tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate;
(b) bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite;
(c) a costabilizer selected from the group consisting of sodium stearoyl lactylate, calcium stearoyl lactylate, calcium lactate, and mixtures thereof;
(d) 2-Naphthalenecarboxamide, N,N′-(2-chloro-1,4 phenylene)bis[4-[(2,5-dichlorophenyl)azo]-3-hydroxy-;
(e) a stereoregular, branched-mono-1-olefin polymer.
These and other objects, features, aspects, and advantages of this invention will become better understood with reference to the following description and claims.
DETAILED DESCRIPTION OF THE INVENTION
The SBM polymers that can be used in this invention are those polymers that have been formed by polymerization of branched mono-1-olefins. These branched-mono-1-olefins have the following structure.
wherein R
1
is a hydrogen or a C
n
H
(2n+1)
alkyl, where n is an integer from 1 to about 4; and wherein R
2
is hydrogen or a C
x
H
(2x+1)
alkyl, where x is an integer from 1 to about 6. Examples of branched-mono-1-olefins useful in this invention are: propylene; 3-methyl-1-butene; 3-methyl-1-pentene; 4-methyl-1-pentene; and 3-ethyl-1-hexene. These branched-mono-1-olefins can be polymerized by any method in the art, thereby producing the SBM polymers useful in this invention. Each of these branched-mono-1-olefins could be polymerized alone to form a SBM homopolymer, or it could be polymerized with any of the other branched-mono-1-olefins to form a SBM copolymer. Additionally, a branched-mono-1-olefin could be polymerized with monomers such as ethylene, 1-butene, 1-pentene, 1-hexene, or mixtures thereof, to form a SBM-monomer copolymer. However, it is believed that the major portion of this SBM-monomer copolymer should be a branched-mono-1-olefin in order to retain the benefits of this invention. The term “major portion” for the purposes of this specification means greater than 50 mole percent based on the total number of moles of branched-mono-1-olefin and monomer present in the SBM-monomer copolymer.
The additive composition of this invention comprises: (a) tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate; (b) bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite; (c) a costabilizer selected from the group consisting of sodium stearoyl lactylate, calcium stearoyl lactylate, calcium lactate, and mixtures thereof. The components of this composition can be further described as follows.
Tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate also known as 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-s-triazine 2,4,6 (1H,3H, 5H)trione is commercially available from the Ciba-Geigy Corporation as Irganox 3114. Bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is commercially available from the General Electric Corporation as Ultranox 626. Sodium stearoyl lactylate, calcium stearoyl lactylate, and calcium lactate is available from the C.J. Patterson Company as Pationic 920, 940, 1230 and 1240.
The sodium stearoyl lactylate used in this invention has an acidic ph (i.e. a ph below about 7). The calcium stearoyl lactylate used in this invention has a basic ph (i.e. a ph above about 7). The calcium lactate composition used in the invention has a neutral to basic ph (i.e. a ph about or above 7).
The amount of each additive to use in the additive composition is generally in the range of about 1 weight percent to about 98 weight percent based on the total weight of the additive composition. However, it is preferred that the amounts used by “substantially equal” for best results. The term “substantially equal” means for the purposes of this specification that the weight ratio of any one component to another component is within the range of about 0.5 to about 2. For example, an additive composition could have 5 parts by weight Irganox 3114, 10 parts by weight Ultranox 626, and 10 parts by weight Pationic 1230.
The amount of each additive to use in the SBM polymer composition is generally in the range of about 0.001 weight percent to about 5 weight percent based on the weight of the entire composition. However, it is preferred that the amount of each additive is in the range of about 0.005 to about 3 weight percent; and most preferably the amount of each additive is in the range of 0.01 to 1 weight percent. Generally, the total amount of additives to add to the SBM polymer is not greater than about 5 weight percent based on the weight of the entire composition. However, amounts as low as about 0.01 weight percent may be used. If too little of these additives are added to the SBM polymer to form the SBM polymer composition, the SBM polymer composition might not obtain the full benefits of this invention. Furthermore, adding too much of the additives can be expensive and can adversely affect the other properties of the SBM polymer composition.
2-Naphthalenecarboxamide, N,N′-(2-chloro-1,4 phenylene)bis[4-[(2,5- dichlorophenyl)azo]-3-hydroxy-, (CA Index name) also known as, 2-Naphthamide, N,N′-(2-chloro-p-phenylene)bis[4-[(2,5-dichlorophenyl)azo]-3-hydroxy-, (another CA Index name) is bluish red pigment. It is commonly known as C.I. 20735 and C.I. Pigment Red 144. The chemical structure is as follows.
where X=
The amount to use of C.I. Pigment Red 144 is from about 0.0001 to about 5 weight percent based on the weight of the entire composition (SBM polymer, pigment, and additives). However, it is preferred that the amount used is from about 0.005 to about 3 weight
Bowman Edward L.
Corvin Carl D.
Phillips Petroleum Company
Sanders Kriellion
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