United States Patent [19] [11] Patent Number: 4,824,885
Magni et al. [45] Date of Patent: Apr. 25, 1989
[54] PROCESS OF (CO) POLYMERIZATION OF ALPHA-OLEFINS IN THE PRESENCE OF ANTIOXIDANTS
[75] Inventors: Ambrogio Magni, Robbiate; Erik Bersanetti, Milan, both of Italy
[73] Assignee: Enichem Sintesi S.p.A., Palermo,
Italy
[21] Appl. No.: 70,179
[22] Filed: Jul. 6,1987
[30] Foreign Application Priority Data
Jul. 23, 1986 [IT] Italy 2122A/86
[51] Int. CI.* C08K 5/52; C08K 5/53
[52] U.S. CI 524/120; 524/117;
524/121; 524/126; 524/128; 524/133; 524/135; 524/147; 524/151; 524/153; 526/139; 526/193
[58] Field of Search 524/126, 128, 117, 120,
524/121, 133, 135, 151, 147, 153; 526/81, 84,
139, 193
[56] References Cited
U.S. PATENT DOCUMENTS
2,847,443 8/1958 Heckenbleikner et al 524/117
2,973,348 2/1961 Coover et al 526/139
3,264,277 8/1966 Winkler et al 526/139
3,558,586 1/1971 Fodor 526/139
3,632,690 1/1972 Dever et al 524/117
3,903,208 9/1975 Hofer 524/135
4,233,207 11/1980 Spivack 524/135
4,386,011 5/1983 Fodor 526/139
4,495,320 1/1985 Chasar 524/117
FOREIGN PATENT DOCUMENTS
59-16431 9/1984 Japan . 59-164307 9/1984 Japan .
OTHER PUBLICATIONS
Williams, J. L. et al-J. Applied Polymer Science, vol. 27, 951-955 (1982).
Henman, T. J.-Developments in Polymer Stabilization-!, 39 to 100 (1979).
Encyclopedia of Polymer Sci. and Eng.-vol. 6, p. 441. Kirk-Othmer Encyclopedia of Chem. Tech. Third Ed. vol. 16, pp. 424-427, 440,441,446 and 447. Polyolefin Plastics-ed. Theordore Kresser (1970) pp. 72,73,78 to 81.
CA 102 (1985) 46425 v; 46426 w; 46427 x; 46428 y.
Primary Examiner—Veronica P. Hoke
Attorney, Agent, or Firm—Stevens, Davis, Miller &
Mosher
[57] ABSTRACT
Stabilizers for organic polymers, consisting of one or more phosphorus-containing compounds of the family of alkyl- and/or phenyl-phosphites, alkyl- and/or phenyl-phosphonites, alkyl- and/or phenyl-diphosphonites, are directly added to the reaction mixture during the (co)polymerization of a-olefins or of mixtures thereof with other unsaturated monomers.
The so-obtained polymeric compositions result perfectly stabilized, and show a thermo-oxidative resistance higher than that of the same polymeric compositions to which the same antioxidants have been added by a traditional route.
11 Claims, 3 Drawing Sheets
