Method of making a foundry mold or core with an anaerobically cured adhesive

Claim 3

Method according to claim 1, in which the substantially oxygen-free environment is attained by displacing air or other oxygen-containing gas by a gas or vapor which does not inhibit curing of the anaerobic adhesive.

Claim 4

Method according to claim 2, in which the air or other oxygen-containing gas is displaced by nitrogen.

Claim 5

Method according to claim 1, in which the foundry mold or core is maintained in a substantially oxygen-free environment for a minimum of 10 minutes.

Claim 6

Method according to claim 1, in which ingress of air into the foundry mold or core while the adhesive is curing is prevented by wrapping the shaped article in an air-impermeable film.

Claim 7

Method according to claim 1, in which ingress of air into the foundry mold or core while the adhesive is curing is prevented by coating the foundry mold or core with an air-impermeable sealing composition formed in situ by coating the surface of the foundry mold or core with an aerobically-curing agent for the adhesive.

Claim 8

Foundry molds or cores made by the method of claim 1.

Claim 9

Method according to claim 1, in which the ester (a) is of the general formula ##STR13## where a is an integer of 1 to 8, b is an integer of 1 to 20, c is zero or 1, R denotes --H, --Ch 3 , --CH 3 , --C 2 H 5 , --CH 2 OH, or ##STR14## R 2 denotes --H, --OH, or ##STR15## and R 1 denotes --H, --Cl, --CH 3 , or --C 2 H 5 .

Claim 10

Method according to claim 1, in which the ester (a) is of the general formula ##STR16## where b, c, R 1 and R 2 have the meaning assigned in claim 8, d is zero or a positive integer, provided that c and d are not both zero, e is 1, 2, 3, or 4, and R 3 denotes an organic radical of valency e, linked through a carbon atom or carbon atoms thereof to the indicated b oxygen atoms.

Claim 11

Method according to claim 9, in which R 3 is the hydrocarbon residue of an aliphatic alcohol containing from 1 to 6 carbon atoms.

Claim 12

Method according to claim 1, in which the ester (a) is of the general formula ##STR17## where c has the meaning assigned in claim 8, e has the meaning assigned in claim 9, R 4 denotes --H or --CH 3 , and R 5 denotes an organic radical of valency e, linked through a carbon atom other than the carbon atom of a carbonyl group.

Claim 13

Method according to claim 11, in which e is zero and R 5 denotes the residue, containing from 1 to 18 carbon atoms, of an alcohol or phenol having e hydroxy groups.

Claim 14

Method according to claim 11, in which c is 1 and R 5 denotes the residue, containing from 1 to 60 carbon atoms, of an acid having e carboxyl groups.

Claim 15

Method according to claim 1, in which the ester (a) is of the general formula ##STR18## where R 1 has the meaning assigned in claim 8, R 6 denotes a divalent aliphatic, cycloaliphatic, aromatic, or araliphatic group, bound through a carbon atom or carbon atoms thereof to the indicated --O-- atom and --X-- atom or group, X denotes --O-- or --N(R 8 ), where R 8 stands for --H or an alkyl radical of from 1 to 8 carbon atoms, g is an integer of at least 2 and at most 6, and R 7 denotes a g-valent aliphatic, cycloaliphatic, aromatic, or araliphatic group, bound through a carbon atom or carbon atoms thereof to the indicated NH groups.

Claim 16

Method according to claim 14, in which R 6 denotes a divalent aliphatic group of 2 to 6 carbon atoms.

Claim 17

Method according to claim 14, in which R 7 denotes a divalent aliphatic group of 2 to 10 carbon atoms; a phenylene group, optionally substituted by a methyl group or a chlorine atom; a naphthalene group; a group of formula --C 6 H 4 C 6 H 4 --, --C 6 H 4 CH 2 C 6 H 4 --, or --C 6 H 4 C(CH 3 ) 2 C 6 H 4 --; or a mononuclear alkylcycloalkylene or alkylcycloalkylalkylene group of 6 to 10 carbon atoms.

Claim 18

Method according to claim 1, in which the ester (a) is of the general formula ##STR19## where each R 1 has the meaning assigned in claim 8, each R 8 denotes --H or an alkyl radical of 1 to 6 carbon atoms, optionally substituted by a cyano or hydroxyl group or by a group of formula ##STR20## each R 9 is a divalent aliphatic, aromatic, heterocyclic, or cycloaliphatic residue of 1 to 10 carbon atoms, linking through carbon atoms thereof the indicated nitrogen atoms, h is zero or an integer of from 1 to 3, and j is zero or h.

Claim 19

Method according to claim 1 in which the ester (a) is 1,4-bis(2-hydroxy-3-methacryloyloxypropoxy)butane, 1-(2-hydroxy-3-methacryloyloxypropoxy)butane, bis(2-hydroxy-3-methacryloyloxypropyl) adipate, 2-hydroxy-3-(methacryloyloxy)propyl propionate, tetraethylene glycol diacrylate, tetraethylene glycol bis (methacrylate), a poly (2-hydroxy-3-(methacryloyloxy)propyl)ether of a phenol-formaldehyde novolak, 2,4-bis(2-methacryloyloxyethoxycarbonamido)toluene, 2,6-bis(2-methacryloyloxyethoxycarbonamido)toluene, 1,1,1-trimethylolpropane tris(methacrylate), 1-(2,3-bis(methacryloxyloxy)propoxy)-4-(2-hydroxy-3-methacryloyloxypropoxy)butane, or 1,4-bis(2,3-bis(methacryloyloxypropoxy)butane.

Claim 20

Method according to claim 1, in which the hydroperoxide (b) is of the formula R 10 OOH, where R 10 denotes a monovalent organic radical containig up to 18 carbon atoms.

Claim 21

Method according to claim 1, in which the anaerobic adhesive contains an accelerator (c).

Claim 22

Method according to claim 20, in which the accelerator is a polyalkylenepolyamine or a polymercaptan.

Claim 23

Method according to claim 1, in which there is used from 0.01 to 15% of the polymerisation catalyst (b), calculated on the weight of the anaerobic adhesive.

Claim 24

Method according to claim 20, in which the anaerobic adhesive contains from 1 to 10% of the accelerator (c) calculated on the weight of the ester (a).